Medium severity · published Mar 20, 2026
CVE-2026-33428
Discourse Allows Unauthorized Access to Deleted Posts Index via Group Membership
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
= 2026.3.0-latest; >= 2026.2.0-latest, < 2026.2.1; >= 2026.1.0-latest, < 2026.1.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33428
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33428
Vendor Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-frcw-p4mc-x6mp
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