---
id: CVE-2026-102149
title: >-
  Kiteworks Email Protection Gateway did not sufficiently restrict which account
  a certificate could be assigned to
summary: >-
  Kiteworks Email Protection Gateway did not sufficiently restrict which account
  a certificate could be assigned to. This could allow an attacker to associate
  a certificate with another user's account, affecting the confidentiality and
  int…
severity: critical
cvss: 9.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L'
cwe:
  - CWE-306
vendor: Kiteworks
product: Email Protection Gateway
affected:
  - email_protection_gateway < 9.5.1
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T21:17:03.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102149'
references:
  - url: >-
      https://github.com/kiteworks/security-advisories/security/advisories/GHSA-c9w5-4frw-7wqq
    label: 9119a7d8-5eab-497f-8521-727c672e3725
  - url: >-
      https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-274-01.json
    label: 9119a7d8-5eab-497f-8521-727c672e3725
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-30T21:25:07.838Z'
---

## Overview

Kiteworks Email Protection Gateway did not sufficiently restrict which account a certificate could be assigned to. This could allow an attacker to associate a certificate with another user's account, affecting the confidentiality and integrity of that account's encrypted mail and, where certificate-based login is enabled, potentially permitting unauthorized access to the account.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.