CVE-2026-33428 PUBLISHED

Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership

Assigner: GitHub_M
Reserved: 19.03.2026 Published: 20.03.2026 Updated: 20.03.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 4.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

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

References

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

Problem Types

CWE-863: Incorrect Authorization CWE