CVE-2026-22880

🔶 medium

Summary

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

CVSS Score

6.1

Medium

EPSS Score

0.1

Exploit Probability

Published Date

2026-05-21

First Seen: 2026-05-22

📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 37.4% of all 365,891 vulnerabilities in our database.

#229,149

Below average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 21, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

Doyensec

SSVC data provided by CISA

Last Modified 2026-08-06

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-352

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
mattermost	mattermost_mobile	Affected	< 2.37.1

🔗 References 1

https://mattermost.com/security-updates

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2025-59480	🔶 medium	6.1	0.0	Mattermost Mobile Apps versions <=2.32.0 fail to verify that SSO redirect tokens originate from the trusted server, whic...	2025-11-13
CVE-2025-30516	ℹ️ low	2.0	0.1	Mattermost Mobile Apps versions <=2.25.0 fail to terminate sessions during logout under certain conditions (e.g. poor ...	2025-04-14
CVE-2025-1558	🔶 medium	6.5	0.1	Mattermost Mobile Apps versions <=2.25.0 fail to properly validate GIF images prior to rendering which allows a maliciou...	2025-03-24
CVE-2025-0476	🔶 medium	4.3	0.3	Mattermost Mobile Apps versions <=2.22.0 fail to properly handle specially crafted attachment names, which allows an att...	2025-01-16
CVE-2025-20072	🔶 medium	6.5	0.2	Mattermost Mobile versions <= 2.22.0 fail to properly validate the style of proto supplied to an action's style in post....	2025-01-16
CVE-2025-20630	🔶 medium	6.5	0.2	Mattermost Mobile versions <=2.22.0 fail to properly handle posts with attachments containing fields that cannot be cast...	2025-01-16

These CVEs affect the same products