CVE-2026-6961EPSS p20.9%

CVE-2026-6961CVE-2026-6961

mattermost / mattermost_server

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

Scoring

CVSS 7.6 ()
VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L
EPSS0.29% probability of exploitation · percentile 20.9% · 2026-06-19T12:03:05Z
Last modified2026-06-18
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.