CVE-2026-28272: Kiteworks Email Protection Gateway has a Cross-site Scripting vulnerability

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-27 · updated 2026-06-17
Weakness: CWE-79

Description

Kiteworks is a private data network (PDN). Prior to version 9.2.0, a vulnerability in Kiteworks Email Protection Gateway allows authenticated administrators to inject malicious scripts through a configuration interface. The stored script executes when users interact with the affected user interface. Version 9.2.0 contains a patch for the issue.

Affected products

Kiteworks Email Protection Gateway: before 9.2.0 — fixed in 9.2.0

How to fix

Upgrade to a fixed version: Kiteworks Email Protection Gateway 9.2.0. Check the vendor advisory for mitigations.

References

https://github.com/kiteworks/security-advisories/security/advisories/GHSA-7hxj-ch78-xqgr

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