CVE-2026-22880 json
Mobile SSO authentication flow allows credential theft via malicious server
published 2026-05-21 5 mo ago modified 2026-08-06 3 mo ago also EUVD-2026-31250
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 1%
- public exploits
- 0
- none known
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
Patch / fix
- Mattermost Mattermost 2.37.1.0, 2.38.0, 10.11.12, 11.2.4, 11.3.2, 11.4.1, 11.5.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
References
-
mattermost.com
/security-updates
vendor-advisory
Sources
- CVE List CVE-2026-22880
- NVD CVE-2026-22880
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