CVE-2026-121637 PUBLISHED

WatchGuard AuthPoint Gateway Improper HMAC Validation in LDAP Authentication Callback Allows Forged Authentication Results

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

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	High
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 AtuhPoint Gateway deployments configured with an LDAP provider.

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-2026-121637

Problem Types

CWE-345 CWE