Vulnerability · Published Nov 4, 2026 · Assigned by WatchGuard

CVE-2026-121637WatchGuard AuthPoint Gateway Improper HMAC Validation in LDAP Authentication Callback Allows Forged Authentication Results

High 8.9

In plain English

A high-severity insufficient verification of data authenticity in AuthPoint Authentication Gateway from WatchGuard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 4.0)8.9High

Exploit odds (30 days)0.3%top 81.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 products (as reported)

Vendor	Product	Versions
WatchGuard	AuthPoint Authentication Gateway	1.0 – before 7.6.0

Weakness: CWE-345 · 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

References

https://psirt.watchguard.com/CVE-2026-121637 vendor-advisory