Mattermost versions 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 fail to fully validate role changes which allows an attacker authenticated as team admin to demote users to guest via crafted HTTP requests.
https://mattermost.com/security-updates
Source: Mitre, NVD
Published: 2024-04-26
Updated: 2025-05-12
Base Score: 3.3
Vector: CVSS2#AV:N/AC:L/Au:M/C:N/I:P/A:N
Severity: Low
Base Score: 2.7
Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.00365