CVE-2026-22880

Published May 21, 2026

Last updated a month ago

Overview

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
Source
responsibledisclosure@mattermost.com
NVD status
Analyzed
Products
mattermost_mobile

Risk scores

CVSS 3.1

Type
Secondary
Base score
6.1
Impact score
4
Exploitability score
1.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
Severity
MEDIUM

Weaknesses

responsibledisclosure@mattermost.com
CWE-352

Social media

Hype score
Not currently trending

Configurations

References

Sources include official advisories and independent security research.