PT-2026-115509 · Mattermost · Mattermost
CVSS v3.1
6.5
Medium
| Vector | AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N |
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
Fix
Incorrect Authorization
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Weakness Enumeration
Related Identifiers
Affected Products
Mattermost