CVE-2026-6957

4.9 Moyenne

Publiée le 27/05/2026 à 17:16 · Modifiée le 17/06/2026 à 13:01 · Analysée par le NVD · Source : responsibledisclosure@mattermost.com

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

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Produits concernés

Mattermost
Mattermost legal hold

Scores CVSS

Version	Score	Source	Vecteur
3.1	8.0 Élevée	responsibledisclosure@mattermost.com	`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H`
3.1	4.9 Moyenne	nvd@nist.gov (NVD)	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N`

Faiblesses (CWE)

CWE-22

Références

https://mattermost.com/security-updates Vendor Advisory

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories