CVE-2026-27481 — Discourse: Hidden tag visibility bypass on tag routes

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
discourse / discourse	affected >= 2026.1.0-latest, < 2026.1.3; affected >= 2026.2.0-latest, < 2026.2.2; affected >= 2026.3.0-latest, < 2026.3.0

CWE

CWE-200

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.