Security Advisory

CVE-2026-6961

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-12 15:56:17

Last updated 2026-06-16 13:17:18

Assigner Mattermost

CVSS score 7.6

State PUBLISHED

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

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