CVE-2026-121638 PUBLISHED

WatchGuard AuthPoint Gateway Improper Certificate Validation Allows Man-in-the-Middle Attacks

Assigner: WatchGuard
Reserved: 03.11.2026 Published: 04.11.2026 Updated: 04.11.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 9.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	WatchGuard
Product	AuthPoint Authentication Gateway
Versions	Default: unaffected affected from 1.0 to 7.6.0 (excl.)

Affected Configurations

This vulnerability affects AuthPoint Gateway deployments configured with a RADIUS, LDAP or ADFS resource.

Exploits

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solutions

AuthPoint Authentication Gateway 7.6.0

Credits

WatchGuard AI Security Research finder

References

https://psirt.watchguard.com/CVE-2026-121638

Problem Types

CWE-295 CWE