CVE-2026-56249 Capgo - Unauthorized Channel Overwrite and Ownership Takeover via POST /channel Name Collision

Capgo before 12.128.2 contains an authorization bypass vulnerability in the channel creation endpoint that allows authenticated users to overwrite existing channels by reusing their names. Attackers with app.createchannel permission can exploit a logic mismatch between existence validation and...

BIT-DISCOURSE-2026-27152 DIscourse has DM communication-preference bypass when adding members

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, DM communication-preference bypass when adding members via Chat::AddUsersToChannel — a user could add targets who have blocked/ignored/muted them to an existing DM channel, bypassing per-recipien...

Zulip 安全漏洞

Zulip is a powerful open-source group chat application from Zulip, Inc. for combining the immediacy of real-time chat with the productivity benefits of threaded conversations. A security vulnerability exists in Zulip versions prior to 10.0 to 10.3, which stems from a channel creation permission...