Zero-Day Flaw in Chrome and Chromium Puts Windows and Linux Users at Data Risk

A newly revealed zero-day vulnerability identified as CVE-2025-4664 has triggered serious concerns for billions of Google Chrome and Chromium users. Security experts have warned that this flaw, which affects both Windows and Linux platforms, could be exploited to leak sensitive cross-origin data such as OAuth tokens and session identifiers—all without requiring any user action.  

The vulnerability has been discovered within the Loader component of Chrome and Chromium browsers. It is linked to how these browsers interpret the Link HTTP header for sub-resource requests such as images or scripts. While most mainstream browsers follow strict guidelines for handling such requests, Chrome’s unique behavior stands out. It continues to respect the referrer-policy directive even when loading sub-resources, which can unintentionally expose sensitive information. 

This default behavior can be manipulated by attackers. A malicious site could inject a loose policy like “unsafe-url,” which then forces the browser to reveal complete URLs—including potentially sensitive credentials or session data—to third-party servers. This results in a severe breach of user privacy and circumvents traditional browser security measures.

Cybersecurity firm Wazuh has stated that their Vulnerability Detection module can identify and address this specific flaw. 

The module leverages information from their Cyber Threat Intelligence (CTI) service to monitor

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