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Vulnerabilities

Vulnerability · CVE-2026-121637

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

Published Nov 4, 2026 · catalog updated Nov 4, 2026 · WatchGuard AuthPoint Authentication Gateway

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-121637. EPSS is 0.26%. Act only if a listed version of WatchGuard AuthPoint Authentication Gateway is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.26%
Remediation
Not established
Affected products
vendor WatchGuard AuthPoint Authentication Gateway

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor WatchGuard AuthPoint Authentication Gatewayversion unspecified

How to fix CVE-2026-121637

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-121637. EPSS is 0.26%. Act only if a listed version of WatchGuard AuthPoint Authentication Gateway is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-345: Insufficient Verification of Data Authenticity. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WatchGuard Fireware security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 4, 2026 · CVE.org

    Updated

    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.

  2. Nov 4, 2026 · Canadian Centre for Cyber Security

    Detected

    CVE-2026-121637 is listed by WatchGuard security advisory (AV26-1125).

Sources

  • Canadian Centre for Cyber SecurityGovernment advisoryCVE-2026-121637

    Serial number: AV26-1125 Date: November 4, 2026 As of November 4, 2026, WatchGuard is affected by vulnerabilities in the following product: AuthPoint Authentication Gateway Prior to 7.6.0 The Cyber Centre encourages users and administrators to review the provided web links and ap

    cyber.gc.ca
  • CVE.orgVulnerability recordCVE-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 unauth

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-121637

    30-day exploitation probability 0.26%

    first.org

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Canadian Centre for Cyber SecurityNov 7, 2026
  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026