CVE-2026-121638: critical vulnerability in WatchGuard AuthPoint Authentication Gateway
WatchGuard AuthPoint Gateway Improper Certificate Validation Allows Man-in-the-Middle Attacks
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.1epss 0.3%
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.
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
Affected products
WatchGuard · AuthPoint Authentication GatewayRelated CVEs — WatchGuard AuthPoint Authentication Gateway
In the same product, most dangerous first.
CVE-2026-121639CRITICALWatchGuard AuthPoint Gateway Improper Authentication Allows Unauthenticated Denial of ServiceEPSS 0.7%CVE-2026-121640CRITICALWatchGuard AuthPoint Gateway Capture-replay Allows Unauthorized Administrative ActionsEPSS 0.5%CVE-2026-95676HIGHAuthPoint Gateway Improper Authentication in LDAP Sync Allows First-Factor Authentication BypassEPSS 0.4%CVE-2026-121637HIGHWatchGuard AuthPoint Gateway Improper HMAC Validation in LDAP Authentication Callback Allows Forged Authentication ResultsEPSS 0.3%