CVE-2025-53900: Accellion Kiteworks Managed File Transfer

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Kiteworks MFT orchestrates end-to-end file transfer workflows. Prior to version 9.1.0, an unfavourable definition of roles and permissions in Kiteworks MFT on managing Connections could lead to unexpected escalation of privileges for authorized users. This issue has been patched in version 9.1.0.

Affected products

• Accellion Kiteworks Managed File Transfer: before 9.1.0 (fixed in 9.1.0)

Published 2025-11-29. Last modified 2026-10-07.