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
Published: 2026-05-21
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

Vendor 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.

Tracking

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Advisories

No advisories yet.

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'}


Subscriptions

Mattermost Mattermost
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: 2026-06-17T10:20:33.273

Link: CVE-2026-22880

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses