CVE-2026-28227 — Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Timer publish_to_category

CVE-2026-28227

Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Timer publish_to_category PUBLISHED

Description (CNA)

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

Affected (CNA)

Vendor / product	Versions
discourse / discourse	affected < 2025.12.2; affected >= 2026.1.0-latest, < 2026.1.1; affected >= 2026.2.0-latest, < 2026.2.0

CWE

CWE-863

References

https://github.com/discourse/discourse/security/advisories/GHSA-m49w-78mh-87jp

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.