VULNERABILITY INTELLIGENCE

CVE-2025-6226

CVSS score6.5 MEDIUM
EPSS probability0.37%
CISA KEVNot currently listed
Published2025-07-18
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Description

Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-306

Primary references