High severity7.6NVD Advisory· Published Jun 12, 2026· Updated Jun 15, 2026
CVE-2026-6961
CVE-2026-6961
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=11.6.1, <=11.5.4, <=10.11.15, <=10.11.16
Patches
Vulnerability mechanics
References
1News mentions
1- Mattermost Discloses 7 CVEs: Privilege Escalation, Token Theft, and Federated File WriteVypr Intelligence · Jun 12, 2026