CVE-2026-22880CWE-352csrf

CVE-2026-22880

Medium · published May 21, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
1.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00117 · 1.6th percentile
Weakness
CWE-352 · Cross-Site Request Forgery (CSRF)
Published
2026-05-21T13:16Z
Affected products (1)
ProductVersionsFixed in
mattermost/mattermost_mobile< 2.37.12.37.1
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 21 MAY 08:22Z
    Mobile SSO authentication flow allows credential theft via malicious server
    cvelistv5