GO-2026-6480 Mattermost doesn't enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler in github.com/mattermost/mattermost-server

Mattermost doesn't enforce administrator authorization on the setDefaultInstance call within the /gitlab connect command handler in github.com/mattermost/mattermost-server...

GO-2026-6481 Mattermost doesn't enforce bot-specific permission checks on the user active status endpoint in github.com/mattermost/mattermost-server

Mattermost doesn't enforce bot-specific permission checks on the user active status endpoint in github.com/mattermost/mattermost-server...

GO-2026-6484 Mattermost doesn't validate channel ownership of an existing subscription before applying edits in github.com/mattermost/mattermost-server

Mattermost doesn't validate channel ownership of an existing subscription before applying edits in github.com/mattermost/mattermost-server...

GO-2026-6482 Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation in github.com/mattermost/mattermost-server

Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation in github.com/mattermost/mattermost-server...

CVE-2026-13426: Improper Limitation of a Pathname to a Restricted Directory

The Mattermost Go module github.com/mattermost/mattermost/server/public versions v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost...

GO-2025-4036 Mattermost has an Observable Timing Discrepancy vulnerability in github.com/mattermost/mattermost-server

Mattermost has an Observable Timing Discrepancy vulnerability in github.com/mattermost/mattermost-server...

PT-2025-45866

Mattermost Server allows XSS via CSRF in github.com/mattermost/mattermost-server...

PT-2025-45864

Mattermost Server is vulnerable to XSS through crafted links in github.com/mattermost/mattermost-server...

PT-2025-45854

Mattermost Server does not check if cookies are used over SSL in github.com/mattermost/mattermost-server...

GO-2022-0604 Cross-site Scripting in Mattermost in github.com/mattermost/mattermost-server

Cross-site Scripting in Mattermost in github.com/mattermost/mattermost-server...

GO-2024-3025 Mattermost failed to disallow the modification of local users when syncing users in shared channels in github.com/mattermost/mattermost-server

Mattermost failed to disallow the modification of local users when syncing users in shared channels in github.com/mattermost/mattermost-server...