Description
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects
References (1)
Core 1
Core References
Vendor Advisory
https://mattermost.com/security-updates
Scores
CVSS v3
3.0
EPSS
0.0002
EPSS Percentile
6.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
Status
published
Products (3)
mattermost/mattermost
0 - 8.0.0-20250905150616-ba86dfc5876b6Go
mattermost/mattermost-server
10.11.0 - 10.11.4Go
mattermost/mattermost_server
10.5.0 - 10.5.12
Published
Nov 18, 2025
Tracked Since
Feb 18, 2026