Discourse Image Pipeline Exploit Chains JPEG Race, GhostScript and ImageMagick for File Read

A Discourse image upload exploit allowed basic users to read server files by chaining a JPEG processing delay, Ghostscript execution, and ImageMagick features. The research also exposed a separate cache poisoning flaw that could run JavaScript for anonymous visitors. Researchers reported both issues in June 2026 and patched them before publication. The technical report from […]

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