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CVE-2026-21865

Discourse topic conversion permission vulnerability for moderators PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
discourse / discourseaffected < 3.5.4; affected >= 2025.11.0-latest, < 2025.11.2; affected >= 2025.12.0-latest, < 2025.12.1; affected >= 2026.1.0-latest, < 2026.1.0

CWE

CWE-862

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.