What’s Vulnerable › Vulnerabilities

CVE-2026-102101: Kiteworks Core deserialization of untrusted data

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-10-07
• Weakness: CWE-502

Description

Kiteworks Core before version 9.5.0 is vulnerable to Deserialization of Untrusted Data. A deserialization weakness in Kiteworks Core could, under certain conditions, allow crafted data to be deserialized unsafely, potentially resulting in remote code execution on the appliance. Exploitation depends on an attacker first being able to influence the affected data, so this issue is not exploitable on its own.

Affected products

• Kiteworks Email Protection Gateway: before 9.5.0 — fixed in 9.5.0

How to fix

Upgrade to a fixed version: Kiteworks Email Protection Gateway 9.5.0. Check the vendor advisory for mitigations.

References

• https://github.com/kiteworks/security-advisories/security/advisories/GHSA-x5hx-fgrp-prvf
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json

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