CVE-2026-55167 LDAPAccountManager CVE debrief

Who should care

LAM users with WebAuthn two-factor authentication enabled should assess exposure and upgrade to version 9.6 or later. This issue affects operators managing LAM deployments with WebAuthn two-factor authentication. Security teams should review WebAuthn configuration and monitor for potential authentication attempts. Vulnerability management teams should prioritize LAM version 9.6 or later for affected deployments.

Why it matters

CVE-2026-55167 is a medium-severity issue in LDAP Account Manager that affects WebAuthn two-factor authentication. LAM users should assess exposure and upgrade to version 9.6 or later.

• A user who has completed valid password authentication can retain the same signed WebAuthn ceremony state
• The practical risk is limited by the requirement for a valid password, the same PHP session, and a valid authenticator signature
• Verify LAM version and WebAuthn configuration
• Upgrade to LAM version 9.6 or later to fix the issue

Technical summary

LDAP Account Manager (LAM) versions prior to 9.6 have a WebAuthn authentication challenge issue. The challenge remains in the PHP session after authentication response processing. This allows a user who has completed valid password authentication to retain the same signed WebAuthn ceremony state. The issue is fixed in version 9.6. LAM users with WebAuthn two-factor authentication enabled should assess exposure and upgrade to version 9.6 or later. No additional technical details are available on exploit attempts or root cause.

Defensive priority

Medium priority for LAM users with WebAuthn two-factor authentication

Recommended defensive actions

• Upgrade to LAM version 9.6 or later
• Review WebAuthn two-factor authentication configuration
• Monitor for potential authentication attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the WebAuthn authentication challenge issue in LAM. The issue is fixed in version 9.6. Evidence is limited to CVE Program and NVD records. Defenders should verify LAM version, WebAuthn configuration, and monitor for potential authentication attempts. No additional information is available on affected scope or exploit attempts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.