CVE-2026-2461

EUVD-2026-12411
Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559
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: 13%
Affected Products (NVD)
VendorProductVersion
mattermostmattermost_server
𝑥
< 10.11.11
mattermostmattermost_server
11.0.0 ≤
𝑥
≤ 11.0.3
mattermostmattermost_server
11.1.0 ≤
𝑥
< 11.2.3
mattermostmattermost_server
11.3.0 ≤
𝑥
< 11.3.1
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mattermostmattermost
𝑥
≤ 11.0.3
CNA
mattermostmattermost
𝑥
≤ 11.2.2
CNA
mattermostmattermost
𝑥
≤ 10.10.11
CNA
Common Weakness Enumeration
References
https://mattermost.com/security-updates