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CVE-2026-21865Discourse 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.

Timeline

  1. ID reserved

    By GitHub_M

  2. · 23 days later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-21865, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Analyzed3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.26% · top 82% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Affected products

  • discourse · discourse

    • affected < 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

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .