Vulnerability · Published Nov 4, 2026 · Assigned by WatchGuard
CVE-2026-121638WatchGuard AuthPoint Gateway Improper Certificate Validation Allows Man-in-the-Middle Attacks
Critical 9.1
In plain English
A critical-severity improper certificate validation 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 22% of all known vulnerabilities).
Severity (CVSS 4.0)9.1Critical
Exploit odds (30 days)0.3%top 78.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WatchGuard | AuthPoint Authentication Gateway | 1.0 – before 7.6.0 |
Weakness: CWE-295 · 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
References
- https://psirt.watchguard.com/CVE-2026-121638 vendor-advisory