# CVE-2026-102106: Kiteworks Email Protection Gateway auth bypass in administrative service

Source: https://junglewise.ai/threats/cve-2026-102106-improper-authentication-in-a-kiteworks-email-protection-gateway  
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-2026-102106 · Severity: critical · CVSS 9.1 · Published 2026-09-30

Kiteworks Email Protection Gateway is an email security appliance that manages user accounts and security policies. A flaw in its administrative service allows attackers to bypass password checks and impersonate administrator accounts without authenticating, potentially creating rogue users, deleting legitimate accounts, and locking administrators out of the system entirely.

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-2026-102106 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102106 being exploited in the wild.

**How severe is CVE-2026-102106?** Critical severity, with a CVSS score of 9.1, published 30 September 2026.

**Which products and versions are affected?** Kiteworks Email Protection Gateway before 9.5.0.

**Is there a fix for CVE-2026-102106?** 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-2026-102106 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-102106?** 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

An administrative service in Kiteworks Email Protection Gateway fails to consistently enforce administrator authentication, permitting password-check bypass via valid administrator account reference. An unauthenticated network attacker can create, modify, or delete internal users and managed domains, alter security-feature configuration, and remove user accounts by deleting managed domains, leading to integrity compromise and denial of service. The vulnerability is fixed in version 9.5.0 and later.

## Affected products

- Kiteworks Email Protection Gateway before 9.5.0

## Timeline

- 2026-09-30: disclosed

## References

- [https://github.com/kiteworks/security-advisories/security/advisories/GHSA-wwv8-qhqg-4q76](https://github.com/kiteworks/security-advisories/security/advisories/GHSA-wwv8-qhqg-4q76)
- [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)