# CVE-2026-102127: Kiteworks Email Protection Gateway XXE in XML parser

Source: https://junglewise.ai/threats/cve-2026-102127-an-xml-parser-used-by-kiteworks-email-protection-gateway-did-not  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-102127 · Severity: high · CVSS 7 · Published 2026-09-30

Kiteworks Email Protection Gateway contains an XML external entity (XXE) vulnerability in its message parser. When an optional, non-default message-processing feature is enabled, an unauthenticated attacker can send a crafted email to read sensitive files like encryption keys and credentials from the gateway system, and exfiltrate them to an attacker-controlled destination.

Technologies: [Kiteworks Email Protection Gateway](https://junglewise.ai/threats/technologies/email-protection-gateway). Vendors: [Kiteworks](https://junglewise.ai/threats/vendors/kiteworks).

## Quick answers

**Is CVE-2026-102127 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102127 being exploited in the wild.

**How severe is CVE-2026-102127?** High severity, with a CVSS score of 7, published 30 September 2026.

**Which products and versions are affected?** Kiteworks Email Protection Gateway before 9.5.1.

**Is there a fix for CVE-2026-102127?** A patch was published on 2026-09-30: version 9.5.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-102127 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-102127?** Check whether you run Kiteworks Email Protection Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The XML parser in Kiteworks EPG fails to restrict external entity references, allowing XXE attacks. The vulnerability requires an optional non-default message-processing feature to be enabled and can be exploited remotely without authentication or user interaction. A successful exploit allows arbitrary file read on the gateway service account, potentially exposing cryptographic keys, credentials, and other sensitive data.

## Affected products

- Kiteworks Email Protection Gateway before 9.5.1

## Timeline

- 2026-09-30: disclosed
- 2026-09-30: patched: version 9.5.1

## References

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

## Related threats

- [Kiteworks Email Protection Gateway improper access control on certificate assignment](https://junglewise.ai/threats/cve-2026-102149-kiteworks-email-protection-gateway-did-not-sufficiently-restrict)
- [Kiteworks Email Protection Gateway arbitrary file write via template injection](https://junglewise.ai/threats/cve-2026-102146-an-authenticated-email-protection-gateway-administrator-holding)
- [Kiteworks Email Protection Gateway resource exhaustion](https://junglewise.ai/threats/cve-2026-102144-a-resource-exhaustion-vulnerability-in-kiteworks-email)
- [Kiteworks Email Protection Gateway unauthenticated file upload](https://junglewise.ai/threats/cve-2026-102143-an-unauthenticated-attacker-could-cause-a-file-with-attacker)
- [Kiteworks Email Protection Gateway authorization bypass in large file exchange](https://junglewise.ai/threats/cve-2026-102139-an-authorization-check-in-the-large-file-exchange-feature-of)