Deserialization in Kiteworks Email Protection Gateway

CVE-2026-102135

On a Kiteworks Email Protection Gateway cluster with database replication enabled, a party trusted by the cluster could submit a crafted serialized object that was deserialized without sufficient validation, potentially allowing code execution as the gateway service account. Replication is disabled by default, and exploitation requires control of a trusted cluster peer or administrative access to the appliance.

Vulnerability class: Insecure Deserialization

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-102135?
CVE-2026-102135 is a medium-severity vulnerability in Kiteworks Email Protection Gateway, classified under Deserialization of Untrusted Data. CVSS score: 6.6/10. Published 2026-09-30.
How severe is CVE-2026-102135?
Medium severity. CVSS v3 base score is 6.6 out of 10.