GHSA-wvcv-9xpm-7mqc
Mattermost doesn't enforce slash command trigger-word uniqueness during command updates
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.5.0, < 11.5.2 | 11.5.2 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.11.0, < 10.11.14 | 10.11.14 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.4.0, < 11.4.4 | 11.4.4 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260306123948-f5fe8ded6b63 | 8.0.0-20260306123948-f5fe8ded6b63 |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260306123948-f5fe8ded6b63 | 5.3.2-0.20260306123948-f5fe8ded6b63 |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to enforce slash command trigger-word uniqueness during command updates which allows an authenticated team member with Manage Own Slash Commands permission to hijack and impersonate existing system or custom slash commands via editing their own slash command trigger to an already-registered trigger through the command update API. Mattermost Advisory ID: MMSA-2026-00597
References
External links from the advisory. They lead to third-party sites.