GHSA-679f-wmrg-qf57
Mattermost allows a removed team member to enumerate all public channels within a private team
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260113182106-a18b80ba4c32 | 8.0.0-20260113182106-a18b80ba4c32 |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260113182106-a18b80ba4c32 | 5.3.2-0.20260113182106-a18b80ba4c32 |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0-rc1, < 10.11.11 | 10.11.11 |
| Go | github.com/mattermost/mattermost-server | >= 11.2.0-rc1, < 11.2.3 | 11.2.3 |
| Go | github.com/mattermost/mattermost-server | >= 11.3.0-rc1, < 11.3.1 | 11.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate team membership when searching channels which allows a removed team member to enumerate all public channels within a private team via the channel search API endpoint. Mattermost Advisory ID: MMSA-2025-00568
References
External links from the advisory. They lead to third-party sites.