Discourse: Anonymous sidebar serialization exposes descriptions of category-restricted tags

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72723
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 16:19:49 UTC
Updated2026-08-10 21:17:23 UTC
DescriptionDiscourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. 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 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/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]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/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/0248e9ca82d0493037a9ca04d73904ccfa... [email protected] github.com
github.com/discourse/discourse/security/advisories/GHSA-4p6q-h74v-5j7p [email protected] github.com
github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c72... [email protected] github.com
github.com/discourse/discourse/pull/42093 [email protected] github.com
github.com/discourse/discourse/pull/42092 [email protected] github.com
github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b... [email protected] github.com
github.com/discourse/discourse/pull/42091 [email protected] github.com
github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec... [email protected] github.com
github.com/discourse/discourse/pull/42094 [email protected] github.com
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