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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.

PUBLISHED Reserved 2026-02-19 | Published 2026-04-03 | Updated 2026-04-07 | Assigner GitHub_M




MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

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

Product status

>= 2026.1.0-latest, < 2026.1.3
affected

>= 2026.2.0-latest, < 2026.2.2
affected

>= 2026.3.0-latest, < 2026.3.0
affected

References

github.com/...course/security/advisories/GHSA-6c9x-3vrp-682x

cve.org (CVE-2026-27481)

nvd.nist.gov (CVE-2026-27481)

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