CVE-2026-28219: Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Banners
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an improper authorization check in the topic management logic allows authenticated users to modify privileged attributes of their topics. By manipulating specific parameters in a PUT or POST request, a regular user can elevate a topic’s status to a site-wide notice or banner, bypassing intended administrative restrictions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. There are no practical workarounds to prevent this behavior other than applying the security patch. Administrators concerned about unauthorized promotions should audit recent changes to site banners and global notices until the fix is deployed.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-28219?
CVE-2026-28219 is classified as a privilege escalation vulnerability that can lead to unauthorized changes in the discussion platform.
How do I fix CVE-2026-28219?
To fix CVE-2026-28219, update Discourse to version 2025.12.2, 2026.1.1, or 2026.2.0 or later.
What impact does CVE-2026-28219 have on Discourse users?
CVE-2026-28219 allows regular users to improperly set topics as global banners, which can disrupt site management.
Who is affected by CVE-2026-28219?
CVE-2026-28219 affects all users of Discourse prior to versions 2025.12.2, 2026.1.1, and 2026.2.0.
Was CVE-2026-28219 fixed in newer versions of Discourse?
Yes, CVE-2026-28219 was fixed in Discourse versions 2025.12.2, 2026.1.1, and 2026.2.0.