VULNERABILITY INTELLIGENCE

CVE-2026-6961

CVSS score7.6 HIGH
EPSS probability0.30%
CISA KEVNot currently listed
Published2026-06-12
Last modified2026-06-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L

Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-22

Primary references