Description
Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly enforce channel member management permissions in playbook runs, allowing authenticated users without the 'Manage Channel Members' permission to add or remove users from public and private channels by manipulating playbook run participants when the run is linked to a channel.
References (1)
Core 1
Core References
Vendor Advisory
https://mattermost.com/security-updates
Scores
CVSS v3
4.3
EPSS
0.0017
EPSS Percentile
37.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-863
Status
published
Products (4)
mattermost/mattermost
0 - 8.0.0-20250520060012-d0380305ef7aGo
mattermost/mattermost-server
0 - 0.0.0-20250520060012-d0380305ef7aGo
mattermost/mattermost_server
10.8.0 (4 CPE variants)
mattermost/mattermost_server
9.11.0 - 9.11.16
Published
Jun 20, 2025
Tracked Since
Feb 18, 2026