CVE-2026-102135 Kiteworks Email Protection Gateway Deserialization of Untrusted Data

What is CVE-2026-102135?

CVE-2026-102135 is a medium-severity unsafe deserialization vulnerability in Accellion Kiteworks, published on 30 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

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.

Weakness: CWE-502

Which versions are affected by CVE-2026-102135?

It affects 1 product.

Products include Accellion Kiteworks.

How do I fix CVE-2026-102135?

No fix has been published for CVE-2026-102135 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2026-102135 being exploited?

There is no known exploitation of CVE-2026-102135 in the wild and no public exploit code.

Other vulnerabilities in Accellion Kiteworks

• CVE-2026-102115 Kiteworks Core Authentication Bypass in the Password Reset Workflow Critical 9.8
• CVE-2026-102149 Kiteworks Email Protection Gateway Improper Access Control Critical 9.4
• CVE-2026-102147 Kiteworks Core Administrative Account Takeover through Stored Cross-site Scripting (XSS) Critical 9.3
• CVE-2026-102095 Kiteworks Email Protection Gateway server-side request forgery Critical 9.1
• CVE-2026-102102 Kiteworks Email Protection Gateway server-side request forgery Critical 9.1

All Accellion Kiteworks vulnerabilities

Sources

• CVE record
• NVD
• OSV
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