BIT-DISCOURSE-2026-45085 Discourse: Chat misauthorization and information disclosure

Discourse is an open-source discussion platform. From versions 2026.1.0 to before 2026.1.4, 2026.3.0 to before 2026.3.1, and 2026.4.0 to before 2026.4.1, four authorization/disclosure issues in the chat plugin one also involving discourse-calendar: read-only category users could create chat...