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CVE-2026-46619 – Authentication Bypass via LDAP Injection – OpenAM before 16.1.1

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Summary

CVE-2026-46619 is an LDAP injection vulnerability (CWE-90) in the MSISDN authentication module of OpenAM, an open-source identity and access management platform. The flaw allows an unauthenticated remote attacker to inject LDAP filter metacharacters via the MSISDN value and obtain a valid session without supplying any credentials. It affects all OpenAM Community Edition versions prior to 16.1.1 and carries a critical severity rating.

Technical details

  • Root cause: OpenAM’s MSISDN authentication module concatenates the request-supplied MSISDN value directly into an LDAP search filter without sanitizing it, allowing injection of LDAP metacharacters.
  • Trigger conditions: The MSISDN authentication module must be enabled in an authentication chain for a realm, and the request must reach OpenAM through the trusted-gateway list, which allows all traffic by default (CWE-1188, insecure default configuration).
  • Attack vector: Network — no authentication or user interaction is required; the attacker only needs to reach the MSISDN authentication endpoint.
  • Impact: A crafted LDAP injection payload can manipulate the authentication filter logic to bypass the MSISDN credential check entirely, letting the attacker obtain an arbitrary valid OpenAM session and thereby fully bypass authentication for the affected realm.

Affected software

  • OpenAM (Open Identity Platform / OpenIdentityPlatform fork), Community Edition, all versions through 16.0.6
  • Fixed in OpenAM 16.1.1

Severity

  • CVSS Score: 9.3 (Critical)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade OpenAM to version 16.1.1 or later, which sanitizes MSISDN input before it is used in LDAP filter construction.
  • If immediate patching is not possible: Disable the MSISDN authentication module in all authentication chains, or restrict/tighten the trusted-gateway configuration so it does not permit traffic from arbitrary/untrusted sources by default. Review authentication chain configurations for any realm exposing the MSISDN module to the internet.

References

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