CVE-2026-27481

Discourse: Hidden tag visibility bypass on tag routes

State: Published
Severity: 6.3 Medium
Published: Apr 3, 2026
Updated: Apr 7, 2026
Reserved: Feb 19, 2026

Description

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authorization bypass vulnerability allows unauthenticated or unauthorized users to view hidden (staff-only) tags and its associated data. All Discourse instances with tagging enabled and staff-only tag groups configured are impacted. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
discoursediscourse	>= 2026.1.0-latest, < 2026.1.3Affected >= 2026.2.0-latest, < 2026.2.2Affected >= 2026.3.0-latest, < 2026.3.0Affected

References

https://github.com/discourse/discourse/security/advisories/GHSA-6c9x-3vrp-682x

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