Vulnerability Details CVE-2026-6062
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscription before applying edits which allows an authenticated attacker to hijack subscriptions from channels they have no access to via a crafted PUT request to the subscription edit endpoint.. Mattermost Advisory ID: MMSA-2026-00650
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 4.8%
CVSS Severity
CVSS v3 Score 6.4
References