CVE-2026-102143: Kiteworks Email Protection Gateway

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An unauthenticated attacker could cause a file with attacker-controlled content to be written to the appliance filesystem through an administrative upload handler that did not properly authenticate the request. This did not by itself result in code execution, which would require a separate vulnerability to place the file in an executable location.

Affected products

• Kiteworks Email Protection Gateway: before 9.5.1 (fixed in 9.5.1)

Published 2026-09-30. Last modified 2026-10-01.