VULNERABILITY INTELLIGENCE

CVE-2026-6062

CVSS score6.4 MEDIUM
EPSS probability0.24%
CISA KEVNot currently listed
Published2026-06-22
Last modified2026-06-23
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L

Description

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

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-639

Primary references