CVE-2026-27481 PUBLISHED

Discourse: Hidden tag visibility bypass on tag routes

Assigner: GitHub_M
Reserved: 19.02.2026 Published: 03.04.2026 Updated: 03.04.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 6.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	discourse
Product	discourse
Versions	Version >= 2026.1.0-latest, < 2026.1.3 is affected Version >= 2026.2.0-latest, < 2026.2.2 is affected Version >= 2026.3.0-latest, < 2026.3.0 is affected

References

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

Problem Types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE