Is there a public exploit for CVE-2026-121637?

No public exploit for CVE-2026-121637 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-121637?

CVE-2026-121637 scores CVSS 8.9 (v4.0), rated high.

What does CVE-2026-121637 affect?

CVE-2026-121637 affects WatchGuard AuthPoint Authentication Gateway.

8.9 High

An improper integrity validation vulnerability in WatchGuard AuthPoint Gateway's LDAP authentication callback allows a network attacker who…

CVE-2026-121637

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.

Assessment

CVSS: 8.9 (v4.0)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 4 November 2026
Affected: WatchGuard · AuthPoint Authentication Gateway
Assigner: WatchGuard

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

At the source

EUVD (ENISA)

References

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

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