| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0, < 10.11.15≥ 10.11.0+incompatible, < 10.11.15+incompatible≥ 11.4.0, < 11.4.5≥ 11.4.0+incompatible, < 11.4.5+incompatible≥ 11.5.0, < 11.5.4≥ 11.5.0+incompatible, < 11.5.4+incompatible≥ 11.6.0, < 11.6.1≥ 11.6.0+incompatible, < 11.6.1+incompatible | 10.11.1510.11.15+incompatible11.4.511.4.5+incompatible11.5.411.5.4+incompatible11.6.111.6.1+incompatible |
| mattermost server | ≥ 10.11.0, < 10.11.15≥ 11.4.0, < 11.4.5≥ 11.5.0, < 11.5.4≥ 11.6.0, < 11.6.1 | 10.11.1511.4.511.5.411.6.1 |
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to sanitize team member data when returned via API to users without elevated permissions which allows a user without permissions to get data about team members roles via invoking various team API endpoints. Mattermost Advisory ID: MMSA-2026-00626.
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