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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2026-21865

Discourse topic conversion permission vulnerability for moderators

Description

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, site admin can temporarily revoke the moderation role from untrusted moderators or remove the moderator group from the "personal message enabled groups" site setting until the Discourse instance has been upgraded to a version that has been patched.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

discourse discourse

  • < 3.5.4affected
  • >= 2025.11.0-latest, < 2025.11.2affected
  • >= 2025.12.0-latest, < 2025.12.1affected
  • >= 2026.1.0-latest, < 2026.1.0affected

References