---
id: CVE-2026-121637
title: >-
  WatchGuard AuthPoint Gateway Improper HMAC Validation in LDAP Authentication
  Callback Allows Forged Authentication Results
summary: >-
  An improper integrity validation vulnerability in WatchGuard AuthPoint
  Gateway's LDAP authentication callback allows a network attacker who has
  obtained a valid header signature to forge the authentication result and
  transaction identifi…
severity: high
cvss: 8.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N'
cvssSource: cna
cwe:
  - CWE-345
vendor: WatchGuard
product: AuthPoint Authentication Gateway
affected:
  - authpoint_authentication_gateway >= 1.0 < 7.6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-04T16:38:03.602877Z'
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T18:20:22.014Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121637'
references:
  - url: 'https://psirt.watchguard.com/CVE-2026-121637'
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.483Z'
---

## Overview

An improper integrity validation vulnerability in WatchGuard AuthPoint Gateway's LDAP authentication callback allows a network attacker who has obtained a valid header signature to forge the authentication result and transaction identifier in the request body, resulting in unauthorized session outcomes.

## Affected

- `authpoint_authentication_gateway >= 1.0 < 7.6.0`

## Remediation

AuthPoint Authentication Gateway 7.6.0