CVE-2026-102135CWE-502insecure-deserialization

CVE-2026-102135

Medium · published October 1, 2026

CVSS v3.1
6.6
EPSS
1%
Percentile
69.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.6 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01276 · 69.7th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-10-01T01:17Z
Affected products (1)
ProductVersionsFixed in
accellion/kiteworks< 9.5.19.5.1
References (2)
https://github.com/kiteworks/security-advisories/security/advisories/GHSA-vmwr-r5xq-hp49 · 9119a7d8-5eab-497f-8521-727c672e3725https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json · 9119a7d8-5eab-497f-8521-727c672e3725
EPSS history
Timeline
  • 02 OCT 03:41Z
    EPSS moved — → 1%
    epss
  • 30 SEP 20:12Z
    Kiteworks Email Protection Gateway Deserialization of Untrusted Data
    cvelistv5