| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | = 11.10.0≥ 11.7.0, < 11.7.10≥ 11.8.0, < 11.8.6≥ 11.9.0, < 11.9.2 | 11.7.1011.8.611.9.2 |
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate the combination of guest and admin scheme roles which allows an authenticated attacker to escalate a guest account to team or channel admin via a crafted PUT request to the member roles API endpoint.. Mattermost Advisory ID: MMSA-2026-00752
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