What’s Vulnerable › Vulnerabilities

CVE-2026-102127: Kiteworks Email Protection Gateway Improper Restriction of XML External Entity Reference

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-10-08
• Weakness: CWE-611

Description

An XML parser used by Kiteworks Email Protection Gateway did not restrict external entity references. Where an optional, non-default message-processing feature is enabled, a remote and unauthenticated sender could potentially use a crafted message to read files accessible to the gateway service account, including cryptographic key material and credentials, and have them sent to a destination they control.

Affected products

• Kiteworks Email Protection Gateway: before 9.5.1 — fixed in 9.5.1

How to fix

Upgrade to a fixed version: Kiteworks Email Protection Gateway 9.5.1. Check the vendor advisory for mitigations.

References

• https://github.com/kiteworks/security-advisories/security/advisories/GHSA-9jwc-h943-6f84
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json

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