CVE-2026-22880: Mobile SSO authentication flow allows credential theft via malicious server

Published May 21, 2026
·
Updated

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 Software

1 affected component
Mattermost Mattermost Mobile Apps<=2.37, =11.4, =2.0.37, =11.0.4, =11.1.3, =11.3.2, =10.11.11.0

Remediation

Information

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.

Event History

May 21, 2026
CVE Published
via MITRE·08:22 AM
Data Sourced
via MITRE·08:22 AM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·09:16 AM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-22880?

The severity of CVE-2026-22880 is medium, rated at 6.1.

2

How do I fix CVE-2026-22880?

To fix CVE-2026-22880, update to Mattermost Mobile Apps versions 2.38.0, 11.5.0, or higher.

3

What does CVE-2026-22880 exploit?

CVE-2026-22880 exploits the authentication flow which fails to properly validate the SSO authentication callback origin.

4

Which versions of Mattermost Mobile Apps are affected by CVE-2026-22880?

Mattermost Mobile Apps versions <=2.37, 11.4, 2.0.37, 11.0.4, 11.1.3, 11.3.2, and 10.11.11.0 are affected by CVE-2026-22880.

5

What type of vulnerability is CVE-2026-22880 categorized as?

CVE-2026-22880 is categorized as a CSRF vulnerability.

Company

Resources

Contact

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