What’s Vulnerable › Vulnerabilities
CVE-2026-22880: Mobile SSO authentication flow allows credential theft via malicious server
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-21 · updated 2026-08-06
- Weakness: CWE-352
Description
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
Affected products
- Mattermost Mobile: before 2.37.1 — fixed in 2.37.1
How to fix
Upgrade to a fixed version: Mattermost Mobile 2.37.1. Check the vendor advisory for mitigations.
References
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