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 a team admin to promote guests to team admins 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