VULNERABILITY INTELLIGENCE

CVE-2026-10527

CVSS score6.3 MEDIUM
EPSS probability0.26%
CISA KEVNot currently listed
Published2026-08-17
Last modified2026-08-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to reconcile SchemeAdmin flags with a user's current role which allows a user demoted to System Guest to retain Board Admin privileges and perform admin-only operations via the Boards REST API or UI.. Mattermost Advisory ID: MMSA-2026-00691

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-863

Primary references