An authenticated administrator of Kiteworks Email Protection Gateway can exploit a deserialization flaw (CWE-502) by submitting a crafted serialized object to the cluster management interface. The interface deserializes the object without adequate validation, which may lead to arbitrary code execution in the context of the gateway service account. Exploitation requires an administrator account with a specific queue-management privilege. The vulnerability is identified as CVE-2026-102108 with a CVSS 3.1 base score of 7.2 (high severity).

Successful exploitation allows arbitrary code execution with the privileges of the gateway service account, potentially compromising the confidentiality, integrity, and availability of the Email Protection Gateway. However, exploitation requires authenticated access with elevated administrative privileges, limiting the attack surface to trusted administrators with specific queue-management rights.

No official patch or fix is currently documented. Since exploitation requires an authenticated administrator with specific privileges, organizations should restrict access to trusted personnel only. Monitor for unusual activity related to cluster management interfaces. Check the vendor advisory regularly for updates on patches or official mitigations.