CVE-2026-6957EPSS p20.4%

CVE-2026-6957CVE-2026-6957

mattermost / legal_hold

Description

Mattermost Plugins versions <=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destination paths, which allows an administrator of a remote federated Mattermost server to write files to arbitrary locations within the target server's filestore via a malicious filename delivered through the shared-channel attachment sync protocol. Mattermost Advisory ID: MMSA-2026-00659

Scoring

CVSS 8.0 ()
VectorCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS0.29% probability of exploitation · percentile 20.4% · 2026-06-19T12:03:05Z
Last modified2026-06-02

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.