Tag: Microsoft Security Response Center

.NET Bounty Program now offers up to $40,000 in awards

We’re excited to announce significant updates to the Microsoft .NET Bounty Program. These changes expand the program’s scope, simplify the award structure, and offer great incentives for security researchers. The .NET Bounty Program now offers awards up to $40,000 USD for vulnerabilities impacting the .NET and…

How Microsoft defends against indirect prompt injection attacks

Summary The growing adoption of large language models (LLMs) in enterprise workflows has introduced a new class of adversarial techniques: indirect prompt injection. Indirect prompt injection can be used against systems that leverage large language models (LLMs) to process untrusted…

Customer guidance for SharePoint vulnerability CVE-2025-53770

Summary Microsoft is aware of active attacks targeting on-premises SharePoint Server customers. The attacks are exploiting a variant of CVE-2025-49706. This vulnerability has been assigned CVE-2025-53770. SharePoint Online in Microsoft 365 is not impacted. A patch is currently not available for…

Congratulations to the MSRC 2025 Most Valuable Security Researchers!

The Microsoft Researcher Recognition Program offers public thanks and recognition to security researchers who help protect our customers through discovering and sharing security vulnerabilities under Coordinated Vulnerability Disclosure. Today, we are excited to recognize this year’s 100 Most Valuable Researchers…

Congratulations to the top MSRC 2025 Q2 security researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2025 Q2 Security Researcher Leaderboard are…

Rising star: Meet Dylan, MSRC’s youngest security researcher

At just 13 years old, Dylan became the youngest security researcher to collaborate with the Microsoft Security Response Center (MSRC). His journey into cybersecurity is inspiring—rooted in curiosity, resilience, and a deep desire to make a difference. Early beginnings: From…

RedirectionGuard: Mitigating unsafe junction traversal in Windows

As attackers continue to evolve, Microsoft is committed to staying ahead by not only responding to vulnerabilities, but also by anticipating and mitigating entire classes of threats. One such threat, filesystem redirection attacks, has been a persistent vector for privilege…

Congratulations to the Top MSRC 2025 Q1 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2025 Q1 Security Researcher Leaderboard are…

Zero Day Quest 2025: $1.6 million awarded for vulnerability research

This month, the Microsoft Security Response Center recently welcomed some of the world’s most talented security researchers at Microsoft’s Zero Day Quest, the largest live hacking competition of its kind. The inaugural event challenged the security community to focus on…

Announcing the winners of the Adaptive Prompt Injection Challenge (LLMail-Inject)

We are excited to announce the winners of LLMail-Inject, our first Adaptive Prompt Injection Challenge! The challenge ran from December 2024 until February 2025 and was featured as one of the four official competitions of the 3rd IEEE Conference on…

Jailbreaking is (mostly) simpler than you think

Content warning: This blog post contains discussions of sensitive topics. These subjects may be distressing or triggering for some readers. Reader discretion is advised. Today, we are sharing insights on a simple, optimization-free jailbreak method called Context Compliance Attack (CCA),…

Exciting updates to the Copilot (AI) Bounty Program: Enhancing security and incentivizing innovation

At Microsoft, we are committed to fostering a secure and innovative environment for our customers and users. As part of this commitment, we are thrilled to announce significant updates to our Copilot (AI) Bounty Program. These changes are designed to…

Scaling Dynamic Application Security Testing (DAST)

Table of Contents Introduction Why most enterprises have trouble scaling DAST Web endpoint discovery Automated OpenAPI Specification generation solutions that do scale (sort of) Authentication and authorization A scalable DAST solution Web endpoint discovery Authentication and authorization Authentication hook Authorization…

Congratulations to the Top MSRC 2024 Q4 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2024 Q4 Security Researcher Leaderboard are…

Mitigating NTLM Relay Attacks by Default

Introduction In February 2024, we released an update to Exchange Server which contained a security improvement referenced by CVE-2024-21410 that enabled Extended Protection for Authentication (EPA) by default for new and existing installs of Exchange 2019. While we’re currently unaware…

Announcing the Adaptive Prompt Injection Challenge (LLMail-Inject)

We are excited to introduce LLMail-Inject, a new challenge focused on evaluating state-of-the-art prompt injection defenses in a realistic simulated LLM-integrated email client. In this challenge, participants assume the role of an attacker who sends an email to a user.…

Toward greater transparency: Publishing machine-readable CSAF files

Welcome to the third installment in our series on transparency at the Microsoft Security Response Center (MSRC). In this ongoing discussion, we talk about our commitment to providing comprehensive vulnerability information to our customers. At MSRC, our mission is to…

Congratulations to the Top MSRC 2024 Q3 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2024 Q3 Security Researcher Leaderboard are…

Announcing the BlueHat 2024 Sessions

34 sessions from 54 presenters representing 20 organizations! We are thrilled to reveal the lineup of speakers and presentations for the 23rd BlueHat Security Conference, in Redmond WA from Oct 29-30. This year’s conference continues the BlueHat ethos and Secure Future…

Announcing BlueHat 2024: Call for Papers now open

The 23rd edition of Microsoft’s BlueHat security conference will be hosted by the Microsoft Security Response Center (MSRC) at the Redmond, WA corporate campus, October 29 and 30, 2024. BlueHat brings together security researchers and responders from both inside and outside…

Congratulations to the MSRC 2024 Most Valuable Security Researchers!

The Microsoft Researcher Recognition Program offers public thanks and recognition to security researchers who help protect our customers through discovering and sharing security vulnerabilities under Coordinated Vulnerability Disclosure. Today, we are excited to recognize this year’s 100 Most Valuable Researchers…

Microsoft Bounty Program Year in Review: $16.6M in Rewards

We are excited to announce that this year the Microsoft Bounty Program has awarded $16.6M in bounty awards to 343 security researchers from 55 countries, securing Microsoft customers in partnership with the Microsoft Security Response Center (MSRC). Each year we…

Introducing the MSRC Researcher Resource Center

Microsoft partners with the global security researcher community to surface and report security vulnerabilities to protect all users of Microsoft products and services. Researcher submissions help us address immediate threats while also identifying trends and insights to holistically improve the…

Congratulations to the Top MSRC 2024 Q2 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s [Microsoft Researcher Recognition Program](https://www.microsoft.com/en-us/msrc/researcher-recognition-program) leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2024 Q2 Security Researcher Leaderboard are…

What’s new in the MSRC Report Abuse Portal and API

The Microsoft Security Response Center (MSRC) has always been at the forefront of addressing cyber threats, privacy issues, and abuse arising from Microsoft Online Services. Building on our commitment, we have introduced several key updates to the Report Abuse Portal…

Toward greater transparency: Unveiling Cloud Service CVEs

Welcome to the second installment in our series on transparency at the Microsoft Security Response Center (MSRC). In this ongoing discussion, we discuss our commitment to provide comprehensive vulnerability information to our customers. At MSRC, our mission is to protect our…

Mitigating SSRF Vulnerabilities Impacting Azure Machine Learning

Summary On May 9, 2024, Microsoft successfully addressed multiple vulnerabilities within the Azure Machine Learning (AML) service, which were initially discovered by security research firms Wiz and Tenable. These vulnerabilities, which included Server-Side Request Forgeries (SSRF) and a path traversal…

Improved Guidance for Azure Network Service Tags

Summary Microsoft Security Response Center (MSRC) was notified in January 2024 by our industry partner, Tenable Inc., about the potential for cross-tenant access to web resources using the service tags feature. Microsoft acknowledged that Tenable provided a valuable contribution to…

Congratulations to the Top MSRC 2024 Q1 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2024 Q1 Security Researcher Leaderboard are…

Toward greater transparency: Adopting the CWE standard for Microsoft CVEs

At the Microsoft Security Response Center (MSRC), our mission is to protect our customers, communities, and Microsoft from current and emerging threats to security and privacy. One way we achieve this is by determining the root cause of security vulnerabilities…

Embracing innovation: Derrick’s transition from banking to Microsoft’s Threat Intelligence team

Meet Derrick, a Senior Program Manager on the Operational Threat Intelligence team at Microsoft. Derrick’s role involves understanding and roadmapping the complete set of tools that Threat Intel analysts use to collect, analyze, process, and disseminate threat intelligence across Microsoft.…

Update on Microsoft Actions Following Attack by Nation State Actor Midnight Blizzard

This blog provides an update on the nation-state attack that was detected by the Microsoft Security Team on January 12, 2024. As we shared, on January 19, the security team detected this attack on our corporate email systems and immediately…

Microsoft boosts its Microsoft 365 Insider Builds on Windows Bounty Program with higher awards and an expanded scope

Starting today, we are doubling the maximum bounty award for the Microsoft 365 Insider Bug Bounty Program to $30,000 USD for high impact scenarios, such as unauthenticated non-sandboxed code execution with no user interaction. We are also expanding the scope…

From Indiana Jones to Cybersecurity: The Inspiring Journey of Devin

As a young boy, Devin found himself captivated by the adventures of Indiana Jones, the whip-wielding archaeologist from the VHS movies his grandfather showed him. The thrill of unearthing history and the allure of the unknown ignited a spark in…

An Obsession With Impact: The Inspiring Journey of a Dreamer That Led to a Career at Microsoft

Bruce’s story unfolds in Cincinnati, Ohio. As a young boy, he had an ambitious dream of one day becoming the President of the United States. This aspiration remained his guiding star until he began his professional career after college. His…

New Security Advisory Tab Added to the Microsoft Security Update Guide

Today, we are adding a new Security Advisory tab to the Security Update Guide to meet our customers’ needs for a unified and authoritative source for the latest public information about Microsoft security updates and issues. We are continuously listening…

Congratulations to the Top MSRC 2023 Q4 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2023 Q4 Security Researcher Leaderboard are…

Microsoft Actions Following Attack by Nation State Actor Midnight Blizzard

The Microsoft security team detected a nation-state attack on our corporate systems on January 12, 2024, and immediately activated our response process to investigate, disrupt malicious activity, mitigate the attack, and deny the threat actor further access. Microsoft has identified…

Microsoft addresses App Installer abuse

Summary In recent months, Microsoft Threat Intelligence has observed threat actors leveraging social engineering and phishing techniques to target Windows OS users and utilizing the ms-appinstaller URI scheme. We have addressed and mitigated this malicious activity by turning off ms-appinstaller…

Azure Serial Console Attack and Defense – Part 2

This is the second installment of the Azure Serial Console blog, which provides insights to improve defenders’ preparedness when investigating Azure Serial Console activity on Azure Linux virtual machines. While the first blog post discussed various tracing activities, such as…

Microsoft Mitigates Three Vulnerabilities in Azure HDInsight

Summary Summary Microsoft recently remediated one Denial of Service and two Escalation of Privilege vulnerabilities affecting third party components of Azure HDInsight. Access to the target cluster as an authenticated user was a prerequisite for exploitation in all three cases.…

Celebrating ten years of the Microsoft Bug Bounty program and more than $60M awarded

This year marks the tenth anniversary of the Microsoft Bug Bounty Program, an essential part of our proactive strategy to protect customers from security threats. Since its inception in 2013, Microsoft has awarded more than $60 million to thousands of…

Microsoft guidance regarding credentials leaked to GitHub Actions Logs through Azure CLI

Summary Summary The Microsoft Security Response Center (MSRC) was made aware of a vulnerability where Azure Command-Line Interface (CLI) could expose sensitive information, including credentials, through GitHub Actions logs. The researcher, from Palo Alto’s Prisma Cloud, found that Azure CLI…

Journey Down Under: How Rocco Became Australia’s Premier Hacker

Fun facts about Rocco: Microsoft MVR: Rocco is a 2023 Microsoft Most Valuable Researcher. Fitness fanatic: Inspired by old-school body building and countless hours of chopping and carrying wood in the mountains during his youth, Rocco remains a fitness enthusiast,…

Microsoft mitigated exposure of internal information in a storage account due to overly-permissive SAS token

Summary Summary As part of a recent Coordinated Vulnerability Disclosure (CVD) report from Wiz.io, Microsoft investigated and remediated an incident involving a Microsoft employee who shared a URL for a blob store in a public GitHub repository while contributing to…

Results of Major Technical Investigations for Storm-0558 Key Acquisition

On July 11, 2023, Microsoft published a blog post which details how the China-Based threat actor, Storm-0558, used an acquired Microsoft account (MSA) consumer key to forge tokens to access OWA and Outlook.com. Upon identifying that the threat actor had…

Congratulations to the MSRC 2023 Most Valuable Security Researchers!

The Microsoft Researcher Recognition Program offers public thanks and recognition to security researchers who help protect our customers through discovering and sharing security vulnerabilities under Coordinated Vulnerability Disclosure. Today, we are excited to recognize this year’s top 100 Most Valuable…

Microsoft mitigates Power Platform Custom Code information disclosure vulnerability

Summary Summary On 30 March 2023, Tenable informed Microsoft under Coordinated Vulnerability Disclosure (CVD) of a security issue concerning Power Platform Custom Connectors using Custom Code. This feature allows customers to write code for custom connectors. This issue has been…

Microsoft Bug Bounty Program Year in Review: $13.8M in Rewards

We are thrilled to share the results of our collaboration with over 345 security researchers from +45 countries around the world in the past 12 months. Together, we have discovered and fixed more than a thousand potential security issues before…

Updated Researcher Portal Submission Form: Discover the New Fields in the Submission Form

Summary: We are excited to announce the release of the updated Researcher Portal submission form. These new fields allow Security Researchers to provide additional context for the reported security issue, providing product teams with more data for analysis, gain insights…

From Bounty Leaderboards to Microsoft Security Researcher, Meet Cameron Vincent!

Fun Facts: Game you binged: Guitar Hero and Rock Band fanatic. Go to snack: Nutri-Grain Bars. Favorite Drink: Soda – Coca Cola specifically. Favorite Place: Singapore – stayed an extra week after a hacking collaboration and truly fell in love…

Congratulations to the Top MSRC 2023 Q2 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2023 Q2 Security Researcher Leaderboard are:…

Microsoft mitigates China-based threat actor Storm-0558 targeting of customer email

Microsoft has mitigated an attack by a China-based threat actor Microsoft tracks as Storm-0558 which targeted customer emails. Storm-0558 primarily targets government agencies in Western Europe and focuses on espionage, data theft, and credential access. Based on customer reported information…

Breaking Barriers: Aditi’s Journey Through Sight Loss to Microsoft AI Innovator

Facts about Aditi Shah: Tools she uses: Aditi’s main tool is JAWS, a screen reader from Freedom Scientific, which she touts as the best in the market. This tool has made her digital life more manageable, enabling her to perform…

Azure AD アプリケーションにおける特権昇格の潜在的なリスクについて

本ブログは、Potential Risk of Privilege Escalation in Azure AD Applications の抄訳版です。最新の情報は原文を参照してください。 概要 This article has been indexed from Microsoft Security Response Center Read the original article: Azure AD アプリケーションにおける特権昇格の潜在的なリスクについて

Potential Risk of Privilege Escalation in Azure AD Applications

Summary Summary Microsoft has developed mitigations for an insecure anti-pattern used in Azure AD (AAD) applications highlighted by Descope, and reported to Microsoft, where use of the email claim from access tokens for authorization can lead to an escalation of privilege. An…

Microsoft Response to Layer 7 Distributed Denial of Service (DDoS) Attacks

Summary Summary Beginning in early June 2023, Microsoft identified surges in traffic against some services that temporarily impacted availability. Microsoft promptly opened an investigation and subsequently began tracking ongoing DDoS activity by the threat actor that Microsoft tracks as Storm-1359.…

Microsoft mitigates set of cross-site scripting (XSS) vulnerabilities in Azure Bastion and Azure Container Registry

Summary Summary Microsoft recently mitigated a set of cross-site scripting vulnerabilities affecting Azure Bastion and Azure Container Registry (ACR). Exploitation of these vulnerabilities could have potentially allowed for an unauthorized user to gain access to a target user’s session within…

2023 年 6 月のセキュリティ更新プログラム (月例)

2023 年 6 月 13 日 (米国時間) 、マイクロソフトは、マイクロソフト製品に影響する脆弱性を修正するために、セキ This article has been indexed from Microsoft Security Response Center Read the original article: 2023 年 6 月のセキュリティ更新プログラム (月例)

Announcing The BlueHat Podcast: Listen and Subscribe Now!

Available today on all major podcast platforms is The BlueHat Podcast, a new series of security research focused conversations, continuing the themes from the BlueHat 2023 conference (session recordings available to watch here). Since 2005, BlueHat has been where the…

2023 年 5 月のセキュリティ更新プログラム (月例)

2023 年 5 月 9 日 (米国時間)、マイクロソフトは、マイクロソフト製品に影響する脆弱性を修正するために、セキ This article has been indexed from Microsoft Security Response Center Read the original article: 2023 年 5 月のセキュリティ更新プログラム (月例)

Guidance related to Secure Boot Manager changes associated with CVE-2023-24932

Summary Summary Today, Microsoft is releasing CVE-2023-24932, and associated configuration guidance, to address a Secure Boot bypass vulnerability used by the BlackLotus bootkit to exploit CVE-2022-21894. Customers will need to closely follow the configuration guidance to fully protect against this…

Microsoft Vulnerability Severity Classification for Online Services Publication

The Microsoft Security Response Center (MSRC) is always looking for ways to provide clarity and transparency around how we assess the impact of vulnerabilities reported in our products and services. We have published a new Microsoft Vulnerability Severity Classification for…

Congratulations to the Top MSRC 2023 Q1 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2023 Q1 Security Researcher Leaderboard are: Kai…

2023 年 4 月のセキュリティ更新プログラム (月例)

2023 年 4 月 11 日 (米国時間) 、マイクロソフトは、マイクロソフト製品に影響する脆弱性を修正するために、セキ This article has been indexed from Microsoft Security Response Center Read the original article: 2023 年 4 月のセキュリティ更新プログラム (月例)

Best practices regarding Azure Storage Keys, Azure Functions, and Azure Role Based Access

Summary Summary Azure provides developers and security operations staff a wide array of configurable security options to meet organizational needs. Throughout the software development lifecycle, it is important for customers to understand the shared responsibility model, as well as be…

Azure ADを使用するマルチテナント アプリケーションの承認に関する構成ミスの可能性に関するガイダンス

本ブログは、Guidance on Potential Misconfiguration of Authorization of Multi-Tenant Applications that use Azure AD の抄訳版です。最新の情報は原文を参照してください This article has been indexed from Microsoft Security Response Center Read the original article: Azure ADを使用するマルチテナント アプリケーションの承認に関する構成ミスの可能性に関するガイダンス

Guidance on Potential Misconfiguration of Authorization of Multi-Tenant Applications that use Azure AD

Summary Summary Microsoft has addressed an authorization misconfiguration for multi-tenant applications that use Azure AD, initially discovered by Wiz, and reported to Microsoft, that impacted a small number of our internal applications. The misconfiguration allowed external parties read and write…

Microsoft Mitigates Outlook Elevation of Privilege Vulnerability

Summary Summary Microsoft Threat Intelligence discovered limited, targeted abuse of a vulnerability in Microsoft Outlook for Windows that allows for new technology LAN manager (NTLM) credential theft. Microsoft has released CVE-2023-23397 to address the critical elevation of privilege (EoP) vulnerability…

Azure Kubernetes Service (AKS) Threat Hunting

As more businesses shift away from running workloads on dedicated virtual machines to running them inside containers using workload orchestrators like Kubernetes, adversaries have become more interested in them as targets. Moreover, the benefits Kubernetes provides for managing workloads are…

2023 年 2 月のセキュリティ更新プログラム (月例)

2023 年 2 月 14 日 (米国時間) 、マイクロソフトは、マイクロソフト製品に影響する脆弱性を修正するために、セキ This article has been indexed from Microsoft Security Response Center Read the original article: 2023 年 2 月のセキュリティ更新プログラム (月例)

BlueHat 2023: Connecting the security research community with Microsoft

We’re excited to welcome more than 400 members of the security research community from around the world to Redmond, Washington for BlueHat 2023. Hosted by the Microsoft Security Response Center (MSRC), BlueHat is where the security research community, and Microsoft…

BlueHat 2023: Connecting the security research community with Microsoft

We’re excited to welcome more than 400 members of the security research community from around the world to Redmond, Washington for BlueHat 2023. Hosted by the Microsoft Security Response Center (MSRC), BlueHat is where the security research community, and Microsoft…

Microsoft Investigation – Threat actor consent phishing campaign abusing the verified publisher process

Summary On December 15th, 2022, Microsoft became aware of a consent phishing campaign involving threat actors fraudulently impersonating legitimate companies when enrolling in the Microsoft Cloud Partner Program (MCPP) (formerly known as Microsoft Partner Network (MPN)). The actor used fraudulent…

Microsoft Investigation – Threat actor consent phishing campaign abusing the verified publisher process

Summary On December 15th, 2022, Microsoft became aware of a consent phishing campaign involving threat actors fraudulently impersonating legitimate companies when enrolling in the Microsoft Cloud Partner Program (MCPP) (formerly known as Microsoft Partner Network (MPN)). The actor used fraudulent…

Congratulations to the Top MSRC 2022 Q4 Security Researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2022 Q4 Security Researcher Leaderboard are:…

Microsoft resolves four SSRF vulnerabilities in Azure cloud services

Summary  Microsoft recently fixed a set of Server-Side Request Forgery (SSRF) vulnerabilities in four Azure services (Azure API Management, Azure Functions, Azure Machine Learning, and Azure Digital Twins) reported by Orca Security. These SSRF vulnerabilities were determined to be low…

Publishing CBL-Mariner CVEs on the Security Update Guide CVRF API

Microsoft is pleased to announce that beginning January 11, 2023, we will publish CBL-Mariner CVEs in the Security Update Guide (SUG) Common Vulnerability Reporting Framework (CVRF) API. CBL-Mariner is a Linux distribution built by Microsoft to power Azure’s cloud and…