# CVE-2026-102149: Kiteworks Email Protection Gateway improper access control on certificate assignment

Source: https://junglewise.ai/threats/cve-2026-102149-kiteworks-email-protection-gateway-did-not-sufficiently-restrict  
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-2026-102149 · Severity: critical · CVSS 9.4 · Published 2026-09-30

Kiteworks Email Protection Gateway is an email security appliance that protects encrypted mail and manages certificate-based authentication. An attacker can associate a digital certificate with another user's account without proper authorization, potentially reading that user's encrypted emails or gaining unauthorized access if certificate-based login is enabled.

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-2026-102149 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102149 being exploited in the wild.

**How severe is CVE-2026-102149?** Critical severity, with a CVSS score of 9.4, published 30 September 2026.

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

**Is there a fix for CVE-2026-102149?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-102149 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-102149?** 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 Email Protection Gateway fails to properly validate which account a certificate can be assigned to, allowing an attacker to associate arbitrary certificates with other user accounts via a network request. This is a missing authentication/authorization check (CWE-306, CWE-639) exploitable without authentication or user interaction. An attacker can compromise confidentiality and integrity of encrypted mail or achieve account takeover if cert-based authentication is in use.

## Affected products

- Kiteworks Email Protection Gateway before 9.5.1

## Timeline

- 2026-09-30: disclosed

## References

- [https://github.com/kiteworks/security-advisories/security/advisories/GHSA-c9w5-4frw-7wqq](https://github.com/kiteworks/security-advisories/security/advisories/GHSA-c9w5-4frw-7wqq)
- [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 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)
- [Kiteworks Email Protection Gateway deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-102135-on-a-kiteworks-email-protection-gateway-cluster-with-database)