CVE-2026-6961 — CVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation sync
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 …
Published: 2026-06-12 · CVSS: 7.6 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7