VULNERABILITY INTELLIGENCE

CVE-2026-8823

CVSS score3.8 LOW
EPSS probability0.32%
CISA KEVNot currently listed
Published2026-06-22
Last modified2026-06-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L

Description

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged administrator to degrade arbitrary bot accounts via the standard demote-user API.. Mattermost Advisory ID: MMSA-2026-00669

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-863

Primary references