WatchGuard AuthPoint Authentication Gateway Hit by Four Critical Vulnerabilities
WatchGuard has disclosed multiple vulnerabilities in its AuthPoint multi-factor authentication solution, specifically affecting the AuthPoint Authentication Gateway component.
On November 4, 2026, the company published four security advisories. Three received the highest severity rating of Critical and one was rated High. No instances of active exploitation have been confirmed.
Details of CVE-2026-121639
The most severe issue, tracked as CVE-2026-121639, carries a CVSS v4.0 base score of 9.2. It stems from missing authentication for critical functionality. In environments using LDAP or Active Directory, an attacker with network access can perform denial-of-service actions against the authentication service or delete directory synchronization settings without providing credentials.
Additional Vulnerabilities
- CVE-2026-121638 — Improper certificate validation that could allow man-in-the-middle attacks.
- CVE-2026-121640 — Capture-replay weakness enabling unauthorized administrative actions.
- CVE-2026-121637 — Improper HMAC validation in the LDAP authentication callback that permits forged authentication results.
WatchGuard has made patched versions of the gateway available to customers. Organizations using AuthPoint with directory integrations are advised to apply the updates promptly.
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