CVE-2026-22880

EUVD-2026-31250
Mattermost Mobile Apps versions <=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via relaying the SSO code exchange flow through the mobile application. Mattermost Advisory ID: MMSA-2025-00564
CSRF
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
MattermostCNA
6.1 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 3%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mattermostmattermost
𝑥
≤ 2.0.37
CNA
mattermostmattermost
𝑥
≤ 11.0.4
CNA
mattermostmattermost
𝑥
≤ 11.1.3
CNA
mattermostmattermost
𝑥
≤ 11.3.2
CNA
mattermostmattermost
𝑥
≤ 10.11.11
CNA
Common Weakness Enumeration
References
https://mattermost.com/security-updates