Description
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.
References5
- github.com/discourse/discourse/commit/25e9d55b4c652b8dc1c90f44c…
- github.com/discourse/discourse/commit/c9b431b3b75727f7132ec2311…
- github.com/discourse/discourse/commit/f216f258bd473e6299c6aef7b…
- github.com/discourse/discourse/commit/f41e71b645eb60cc263e7a1de…
- github.com/discourse/discourse/security/advisories/GHSA-xrgc-52…
Metrics
- CVSS 3.1
-
4.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - EPSS — exploit probability
- 0% percentile: 28 · as of 12 November 2026
- CWE
- CWE-862
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.