Vulnerability · Published Mar 20, 2026 · Assigned by GitHub_M

CVE-2026-33428Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership

Medium 4.9

In plain English

A medium-severity incorrect authorization in discourse from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 4.0)4.9Medium

Exploit odds (30 days)0.3%top 78.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	= 2026.3.0-latest>= 2026.2.0-latest, < 2026.2.1>= 2026.1.0-latest, < 2026.1.2

Weakness: CWE-863 · Vector: 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

References

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