CVE-2026-6957

MediumCVSS 4.9/10Last modified Jun 17, 2026

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

Metrics

CVSS 3.1 4.9/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-22

Affected software

No affected versions have been published.

Timeline

Published
May 27, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-6957: Medium severity, CVSS 4.9 | Vulnix