CVE-2026-22880

MediumCVSS 6.1/10Last modified Aug 6, 2026

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

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N

Weakness enumeration

CWE-352

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	<= 2.0.37; <= 11.0.4; <= 11.1.3; <= 11.3.2; <= 10.11.11

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: May 21, 2026
Last modified: Aug 6, 2026
NVD status: Analyzed

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