CVE-2026-22880 — Mobile SSO authentication flow allows credential theft via malicious server
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 cont…
Published: 2026-05-21 · CVSS: 6.1 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7