CVE-2026-33428

Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership

State: Published
Severity: 4.9 Medium
Published: Mar 20, 2026
Updated: Mar 25, 2026
Reserved: Mar 19, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	4.9 Medium	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	GitHub_M

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
discoursediscourse	= 2026.3.0-latestAffected >= 2026.2.0-latest, < 2026.2.1Affected >= 2026.1.0-latest, < 2026.1.2Affected

References

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

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