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CVE-2026-22880

Mobile SSO authentication flow allows credential theft via malicious server

MEDIUM

6.1

CVSS Score

Published: May 21, 2026 at 08:22 AM UTC

Updated: August 6, 2026 at 03:53 PM UTC

2 products affected across 1 vendorMattermost MobileMattermost

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Severity

MEDIUM6.1

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost Mobile · Mattermost

95%

v < 2.37.1

Affected range stops below 2.37.1, so it looks safe — our inference, not a vendor statement

Mattermost · Mattermost

60%

v ≤ 10.11.11v ≤ 11.0.4v ≤ 11.1.3v ≤ 11.3.2v ≤ 2.0.37

Vendor states this is fixed in 10.11.12 (unaffected)

Vendor states this is fixed in 11.2.4 (unaffected)

Vendor states this is fixed in 11.3.2 (unaffected)

Vendor states this is fixed in 11.4.1 (unaffected)

Vendor states this is fixed in 11.5.0 (unaffected)

Vendor states this is fixed in 2.37.1.0 (unaffected)

Vendor states this is fixed in 2.38.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://mattermost.com/security-updates

References (1)

Vendor Advisory

Source: cverecord

https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMMattermost

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-352

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