---
id: CVE-2026-121638
title: >-
  WatchGuard AuthPoint Gateway Improper Certificate Validation Allows
  Man-in-the-Middle Attacks
summary: >-
  An Improper Certificate Validation vulnerability in WatchGuard AuthPoint
  Gateway allows an attacker with an on-path network position to intercept and
  modify communications between the AuthPoint Gateway and local authentication
  providers.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-295
vendor: WatchGuard
product: AuthPoint Authentication Gateway
affected:
  - authpoint_authentication_gateway >= 1.0 < 7.6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-04T16:38:45.464042Z'
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T18:20:22.305Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121638'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-121638'
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.485Z'
---

## Overview

An Improper Certificate Validation vulnerability in WatchGuard AuthPoint Gateway allows an attacker with an on-path network position to intercept and modify communications between the AuthPoint Gateway and local authentication providers.

## Affected

- `authpoint_authentication_gateway >= 1.0 < 7.6.0`

## Remediation

AuthPoint Authentication Gateway 7.6.0