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Discourse CVE-2026-31805

| EUVDEUVD-2026-13494 MEDIUM
Improper Input Validation (CWE-20)
2026-03-20 security-advisories@github.com
Authentication Bypass Discourse
5.3
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
Patch available
Apr 16, 2026 - 05:29 EUVD
2026.1.2,2026.2.1
EUVD ID Assigned
Mar 20, 2026 - 08:37 euvd
EUVD-2026-13494
Analysis Generated
Mar 20, 2026 - 08:37 vuln.today
CVE Published
Mar 20, 2026 - 03:15 nvd
MEDIUM 5.3

DescriptionGitHub Advisory

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, an authorization bypass in the poll plugin allowed authenticated users to vote on, remove votes from, or toggle the open/closed status of polls they did not have access to. By passing post_id as an array (e.g. post_id[]=&post_id[]=), the authorization check resolves to the accessible post while the poll lookup resolves to a different post's poll. This affects the vote, remove_vote, and toggle_status endpoints in DiscoursePoll::PollsController. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch.

AnalysisAI

A remote code execution vulnerability in Discourse (CVSS 5.3). Remediation should follow standard vulnerability management procedures.

Technical ContextAI

CWE-20 (Improper Input Validation). Affects Discourse.

RemediationAI

Monitor vendor channels for patch availability.

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Same weakness CWE-20 – Improper Input Validation

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CVE-2026-31805 vulnerability details – vuln.today
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