VULNERABILITY INTELLIGENCE

CVE-2026-16044

CVSS score5.4 MEDIUM
EPSS probability0.29%
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:N/I:L/A:L

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to prevent guest users from receiving Board Admin privileges during board archive import which allows a board member to escalate a guest user to Board Admin via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00672

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-863

Primary references