CVE-2026-10106

EUVD-2026-43312
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
MattermostCNA
6.5 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 7%
Affected Products (NVD)
VendorProductVersion
mattermostmattermost_server
10.11.0 ≤
𝑥
< 10.11.20
mattermostmattermost_server
11.6.0 ≤
𝑥
< 11.6.5
mattermostmattermost_server
11.7.0 ≤
𝑥
< 11.7.3
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mattermostmattermost
11.7.0 ≤
𝑥
≤ 11.7.2
CNA
mattermostmattermost
11.6.0 ≤
𝑥
≤ 11.6.4
CNA
mattermostmattermost
10.11.0 ≤
𝑥
≤ 10.11.19
CNA
Common Weakness Enumeration
References
https://mattermost.com/security-updates