CVE-2026-27481: Discourse: Hidden tag visibility bypass on tag routes
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Discourseto a version that resolves this vulnerability.Fixed in 2026.1.3 - Upgrade
Upgrade
Discourseto a version that resolves this vulnerability.Fixed in 2026.2.2 - Upgrade
Upgrade
Discourseto a version that resolves this vulnerability.Fixed in 2026.3.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-27481?
CVE-2026-27481 is considered a high-severity vulnerability due to its potential for unauthorized data access.
How do I fix CVE-2026-27481?
To fix CVE-2026-27481, update your Discourse installation to version 2026.1.3, 2026.2.2, or any version newer than 2026.3.0.
What systems are affected by CVE-2026-27481?
CVE-2026-27481 affects Discourse versions from 2026.1.0-latest to below 2026.1.3, 2026.2.0-latest to below 2026.2.2, and up to below 2026.3.0.
What type of vulnerability is CVE-2026-27481?
CVE-2026-27481 is an authorization bypass vulnerability allowing unauthorized access to hidden tags.
Is my Discourse site vulnerable to CVE-2026-27481?
If your Discourse installation is running a version between 2026.1.0 and 2026.1.3, 2026.2.0 and 2026.2.2, or up to 2026.3.0, it is vulnerable to CVE-2026-27481.