CVE-2026-33426

LOW
2026-03-20 GitHub_M
3.5
CVSS 3.1

CVSS Vector

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

Lifecycle Timeline

2
Analysis Generated
Mar 20, 2026 - 23:31 vuln.today
CVE Published
Mar 20, 2026 - 23:14 nvd
LOW 3.5

Tags

Authentication Bypass

Description

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, users with tag-editing permissions could edit and create synonyms for tags hidden in restricted tag groups, even if they lacked visibility into those tags. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Analysis

Discourse versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain an authorization bypass vulnerability where users with tag-editing permissions can edit and create tag synonyms for tags within restricted tag groups, even when those users lack visibility into the restricted tags themselves. This represents a broken access control issue (CWE-862) with low CVSS score (3.5) due to high privilege requirement and limited impact scope, though it enables unauthorized information disclosure and tag manipulation within the platform. …

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Remediation

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

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Priority Score

18
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +18
POC: 0

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CVE-2026-33426 vulnerability details – vuln.today
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