CVE-2026-6961 HIGH

CVE-2026-6961: CVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation sync

Vendor Mattermost
Product Mattermost
Weakness CWE-22 · Path traversal
Published June 12, 2026
Last update June 13, 2026
View on NVD All CVEs

CVSS base score

7.6/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality None
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

June 12, 2026 CVE published
June 13, 2026 Record updated