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Findings

CVE-2026-26207

Discourse is an open source discussion platform.

Published Feb 26, 2026 · updated Jun 17, 2026 · discourse discourse

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The loads posts by ID without verifying the current user's access, enabling policy group members to accept/unaccept policies on posts in private categories or PMs they cannot see and any authenticated user to enumerate which post IDs have policies attached via differentiated error responses (information disclosure). The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by adding a check in the before_action, ensuring post visibility is verified before any policy action is processed. As a workaround, disabling the discourse-policy plugin ( ) eliminates the vulnerability. There is no other workaround without upgrading.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 26, 2026 · NIST NVD

    Detected

    Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The loads posts by ID without verifying the current user's access, enabling policy group members to accept/unaccept policies on posts in private categories or PMs they cannot see and any au

  2. Jun 17, 2026 · NIST NVD

    Updated

    Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The loads posts by ID without verifying the current user's access, enabling policy group members to accept/unaccept policies on posts in private categories or PMs they cannot see and any au

Affected

  • cpe discourse/discourseversion unspecified
  • cpe discourse/discourse2026.2.0

Sources

  • NIST NVDVulnerability recordCVE-2026-26207

    Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The loads posts by ID without v

    nvd.nist.gov

References