CVE-2026-6541

EUVD-2026-43341
Mattermost versions 11.7.x <= 11.7.1, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict metric configuration changes to the playbook being saved, which allows an authenticated user with team access to alter another user’s playbook metric settings via a crafted import or update request with a foreign metric ID. Mattermost Advisory ID: MMSA-2026-00653
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
MattermostCNA
4.3 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
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
< 11.7.2
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mattermostmattermost
11.7.0 ≤
𝑥
≤ 11.7.1
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