Mobile SSO authentication flow allows credential theft via malicious server
Summary
| CVE | CVE-2026-22880 |
|---|---|
| State | PUBLISHED |
| Assigner | Mattermost |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-21 09:16:26 UTC |
| Updated | 2026-05-21 15:26:35 UTC |
| 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 |
Risk And Classification
Primary CVSS: v3.1 6.1 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
EPSS: 0.000160000 probability, percentile 0.037990000 (date 2026-05-27)
Problem Types: CWE-352 | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.1 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N |
| 3.1 | CNA | CVSS | 6.1 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
RequiredScope
ChangedConfidentiality
HighIntegrity
NoneAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Mattermost | Mattermost | affected 2.0.37 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.0.4 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.1.3 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 11.3.2 semver | Not specified |
| CNA | Mattermost | Mattermost | affected 10.11.11 semver | Not specified |
| CNA | Mattermost | Mattermost | unaffected 2.38.0 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.5.0 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 2.37.1.0 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.4.1 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.3.2 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 11.2.4 | Not specified |
| CNA | Mattermost | Mattermost | unaffected 10.11.12 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| mattermost.com/security-updates | [email protected] | mattermost.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Doyensec (en)
Additional Advisory Data
Solutions
CNA: 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.
There are currently no legacy QID mappings associated with this CVE.