CVE-2022-0903: Mattermost Server

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A call stack overflow bug in the SAML login feature in Mattermost server in versions up to and including 6.3.2 allows an attacker to crash the server via submitting a maliciously crafted POST body.

Affected products

• Mattermost Mattermost Server: before 5.37.8 (fixed in 5.37.8); from 6.0.0, before 6.1.3 (fixed in 6.1.3); from 6.2.0, before 6.2.3 (fixed in 6.2.3); from 6.3.0, before 6.3.3 (fixed in 6.3.3)

Published 2022-03-10. Last modified 2026-06-17.