CVE-2026-33426

Discourse users can edit or synonymize hidden tags they can't see

State: Published
Severity: 3.5 Low
Published: Mar 20, 2026
Updated: Mar 24, 2026
Reserved: Mar 19, 2026

Description

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, users with tag-editing permissions could edit and create synonyms for tags hidden in restricted tag groups, even if they lacked visibility into those tags. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Scores

CVSS	Score	Vector	Source
3.1	3.5 Low	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N	GitHub_M

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
discoursediscourse	>= 2026.1.0-latest, < 2026.1.2Affected >= 2026.2.0-latest, < 2026.2.1Affected = 2026.3.0-latestAffected

References

https://github.com/discourse/discourse/security/advisories/GHSA-2289-4m46-2hxh

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