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

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Advisories

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Fixes

Solution

Update Mattermost Mobile Apps to versions 2.38.0, 11.5.0, 2.37.1.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher.


Workaround

No workaround given by the vendor.

References
History

Thu, 21 May 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 21 May 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Thu, 21 May 2026 09:00:00 +0000

Type Values Removed Values Added
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
Title Mobile SSO authentication flow allows credential theft via malicious server
Weaknesses CWE-352
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-05-21T12:39:30.334Z

Reserved: 2026-02-23T22:07:32.793Z

Link: CVE-2026-22880

cve-icon Vulnrichment

Updated: 2026-05-21T12:39:16.976Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-21T09:16:26.510

Modified: 2026-05-21T15:26:35.653

Link: CVE-2026-22880

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-21T10:30:08Z

Weaknesses