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...