CVE-2026-33428

Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership

CVSS 4.9 MEDIUMEPSS 0.3%CWE-863

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

20 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a non-staff user with elevated group membership could access deleted posts belonging to any user due to an overly broad authorization check on the deleted posts index endpoint. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

Affected products

discourse · discourse

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References

https://github.com/discourse/discourse/security/advisories/GHSA-frcw-p4mc-x6mp