CVE-2026-27021

MEDIUM
2026-02-26 [email protected]
5.3
CVSS 3.1
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CVSS Vector

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 12, 2026 - 21:56 vuln.today
CVE Published
Feb 26, 2026 - 21:28 nvd
MEDIUM 5.3

Tags

Authentication Bypass Discourse

Description

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the voters endpoint in the poll plugin lacked post visibility checks which allowed unauthorized access to voters details of polls in any post. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

Analysis

The Discourse poll plugin voters endpoint fails to validate post visibility permissions, enabling unauthenticated attackers to enumerate poll voter details across any post in affected instances. This information disclosure affects Discourse versions prior to 2025.12.2, 2026.1.1, and 2026.2.0, with no workaround available until patching. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +26
POC: 0

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CVE-2026-27021 vulnerability details – vuln.today
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