Open Source Discussion Platform Vulnerability in Discourse's Policy Plugin by Discourse

CVE-2026-26207

What is CVE-2026-26207?

The 'discourse-policy' plugin in Discourse enables authenticated users to manipulate policies on posts lacking appropriate permissions. This vulnerability arises from the 'PolicyController' failing to verify the current user's access rights, allowing unauthorized actions on posts in private categories. Users can also exploit the vulnerability to identify post IDs with associated policies by observing distinct error responses. The issue has been addressed in recent versions of Discourse by introducing access checks, reaffirming the significance of verifying post visibility before policy actions.

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References