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Discourse CVE-2026-33425

MEDIUM
Observable Discrepancy (CWE-203)
2026-03-20 GitHub_M
Information Disclosure
5.3
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 20, 2026 - 23:31 vuln.today
CVE Published
Mar 20, 2026 - 23:12 nvd
MEDIUM 5.3

DescriptionNVD

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.

AnalysisAI

An information disclosure vulnerability in Discourse prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 allows unauthenticated attackers to enumerate private group membership by observing directory result changes when manipulating the exclude_groups parameter. This enables attackers to determine whether specific users are members of private groups without authentication, representing a direct privacy violation. …

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CVE-2026-33425 vulnerability details – vuln.today
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