CVE-2026-9693

Mattermost versions 10.11.x = 10.11.20, 11.7.x = 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via t...

CVE-2026-25083

GROWI OpenAI thread/message API endpoints do not perform authorization. Affected are v7.4.5 and earlier versions. A logged-in user who knows a shared AI assistant's identifier may view and/or tamper the other user's threads/messages...

Mattermost Access Control Error Vulnerability (CNVD-2023-55043)

Mattermost is an open source collaboration platform from Mattermost, Inc. in the United States. Mattermost suffers from an Access Control Error vulnerability that stems from not checking the identity of a channel member when accessing a message thread, which can be exploited by an attacker to...