---
title: "CVE-2026-102149: Kiteworks Email Protection Gateway - Broken Access Control"
description: "Kiteworks Email Protection Gateway contains a broken access control vulnerability caused by insufficient restriction on certificate assignment, letting attackers associate certificates with other users' accounts, affecting encrypted mail confidentiality and integrity, and potentially allowing unauthorized access, exploit requires certificate-based login enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-102149/
---

# CVE-2026-102149 Kiteworks Email Protection Gateway - Broken Access Control

Kiteworks Email Protection Gateway contains a broken access control vulnerability caused by insufficient restriction on certificate assignment, letting attackers associate certificates with other users' accounts, affecting encrypted mail confidentiality and integrity, and potentially allowing unauthorized access, exploit requires certificate-based login enabled.

CVSS base score 9.4 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.24% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102149)

## Details

Type

Broken Access Control

Impact

Information Disclosure, Data Tampering, Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Published

30 September 2026

Updated

15 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to the latest version with proper certificate assignment restrictions.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-102149](https://nvd.nist.gov/vuln/detail/CVE-2026-102149)
- [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)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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