PT-2026-51345 · Mattermost · Mattermost
CVE-2026-8823
·
Published
2026-06-22
·
Updated
2026-06-22
CVSS v3.1
3.8
Low
| Vector | AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L |
Name of the Vulnerable Software and Affected Versions
Mattermost version 11.7.0
Mattermost version 10.11.17
Description
Insufficient validation of bot targets occurs when demoting users to guests. This allows a lower-privileged administrator to degrade arbitrary bot accounts through the 'demote-user' API endpoint.
Recommendations
Update Mattermost version 11.7.0 to a newer version.
Update Mattermost version 10.11.17 to a newer version.
As a temporary workaround, restrict access to the 'demote-user' API endpoint for lower-privileged administrators.
Exploit
Fix
LPE
Incorrect Authorization
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Mattermost