CVE-2026-33425

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the `exclude_groups` parameter. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/discourse/discourse/security/advisories/GHSA-r6rh-xvf5-r5f2	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:discourse:discourse::::::::
	cpe:2.3:a:discourse:discourse::::::::
	cpe:2.3:a:discourse:discourse:2026.3.0::::latest:::

History

24 Mar 2026, 19:41

Type	Values Removed	Values Added
First Time		Discourse Discourse discourse
References	~~() https://github.com/discourse/discourse/security/advisories/GHSA-r6rh-xvf5-r5f2 -~~	() https://github.com/discourse/discourse/security/advisories/GHSA-r6rh-xvf5-r5f2 - Mitigation, Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.3
CPE		cpe:2.3:a:discourse:discourse:2026.3.0::::latest::: cpe:2.3:a:discourse:discourse::::::::

21 Mar 2026, 00:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-21 00:16

Updated : 2026-03-24 19:41

NVD link : CVE-2026-33425

Mitre link : CVE-2026-33425

CVE.ORG link : CVE-2026-33425

JSON object : View

Products Affected

discourse

discourse

CWE

CWE-203

Observable Discrepancy

CWE-639

Authorization Bypass Through User-Controlled Key

CWE-862

Missing Authorization

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