CVE-2026-40300

Zulip is an open-source team collaboration tool. Prior to 12.0, With messageedithistoryvisibilitypolicy set to "moves", /api/v1/messages/id/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This...

CVE-2026-40300

Summary of vulnerability (CVE-2026-40300) Affected software: Zulip open-source team collaboration tool (prior to version 12.0). Root cause: When message_edit_history_visibility_policy is set to the value "moves", the endpoint /api/v1/messages/{id}/history continues to return historical content va...