Discourse: Templates endpoint exposes hidden tag names

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72732
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 18:18:51 UTC
Updated2026-08-10 18:18:51 UTC
DescriptionDiscourse 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem Types: CWE-862 | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Discourse Discourse affected < 2026.1.6 Not specified
CNA Discourse Discourse affected >= 2026.5.0-latest, < 2026.5.2 Not specified
CNA Discourse Discourse affected >= 2026.6.0-latest, < 2026.6.1 Not specified
CNA Discourse Discourse affected >= 2026.7.0-latest, < 2026.7.0 Not specified

References

ReferenceSourceLinkTags
github.com/discourse/discourse/commit/f216f258bd473e6299c6aef7b6130e7db9... [email protected] github.com
github.com/discourse/discourse/commit/c9b431b3b75727f7132ec231142371d203... [email protected] github.com
github.com/discourse/discourse/commit/f41e71b645eb60cc263e7a1de222510281... [email protected] github.com
github.com/discourse/discourse/commit/25e9d55b4c652b8dc1c90f44c40c8f3fec... [email protected] github.com
github.com/discourse/discourse/security/advisories/GHSA-xrgc-52m8-82hm [email protected] github.com
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