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Medium severity6.5OSV Advisory· Published Jan 28, 2026· Updated Jun 17, 2026

CVE-2026-21865

CVE-2026-21865

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

6
  • Discourse (software)/DiscourseOSV5 versions
    beta, latest-release, release, …+ 4 more
    • (no CPE)range: beta, latest-release, release, …
    • cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*range: <3.5.4
    • cpe:2.3:a:discourse:discourse:2025.12.0:*:*:*:stable:*:*:*
    • cpe:2.3:a:discourse:discourse:2026.1.0:*:*:*:stable:*:*:*
    • (no CPE)range: <3.5.4, <2025.11.2, <2025.12.1, <2026.1.0
  • osv-coords
    pkg:bitnami/discourse
    Range: < 3.5.4

Patches

Vulnerability mechanics

References

1

News mentions

0

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