Discourse: Templates endpoint exposes hidden tag names
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.3epss 0.3%
exploitation probability
0.3%top 83% of all CVEs
observed exploitation
nono source reports it
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, the discourse_templates endpoint exposed hidden tag names because DiscourseTemplates::TemplatesSerializer in plugins/discourse-templates/app/serializers/discourse_templates/templates_serializer.rb did not filter tags through the request Guardian. The serializer did not respect tag group permissions, allowing users to see tags they were not permitted to view. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Affected products
discourse · discourseReferences
https://github.com/discourse/discourse/commit/25e9d55b4c652b8dc1c90f44c40c8f3fec77748chttps://github.com/discourse/discourse/commit/c9b431b3b75727f7132ec231142371d203a6124bhttps://github.com/discourse/discourse/commit/f216f258bd473e6299c6aef7b6130e7db90116c0https://github.com/discourse/discourse/commit/f41e71b645eb60cc263e7a1de22251028115abf1https://github.com/discourse/discourse/security/advisories/GHSA-xrgc-52m8-82hm