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Advisory severityCritical9.1WatchGuard

Critical [CVE-2026-121638] 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

This critical-severity WatchGuard advisory covers CVE-2026-121638 affecting AuthPoint Authentication Gateway.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-121638 Source published Source updated

VulniPulse record published Record updated

CVE-2026-121638
Affected products & platforms
WatchGuardAuthPoint MFA
Open source advisory

Summary

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 product named by the advisory: AuthPoint Authentication Gateway.

Is CVE-2026-121638 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-121638 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-121638?

Upgrade to a fixed release named by WatchGuard:

  • 7.6.0

Confirm against the vendor advisory before you patch.

Affected versions
  • AuthPoint Authentication Gateway 1.0 before 7.6.0

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions
  • 7.6.0

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation

Upgrade to a fixed release: 7.6.0. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

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