# CVE-2026-123550: OpenAM before 16.1.4 SAML Authentication Bypass via Unsigned Assertions

Status: published. Published: 2026-11-08. Updated: 2026-11-09.

OpenAM before 16.1.4 contains an authentication bypass vulnerability in its SAML v2.0 service provider that accepts unsigned assertions on the ECP (PAOS) and HTTP-Artifact bindings when WantAssertionsSigned is false. Unauthenticated remote attackers can submit forged assertions to obtain sessions as any mapped user, including administrators, and hijack single sign-on to dependent applications.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- OpenIdentityPlatform / OpenAM (org.openidentityplatform.openam/openam-federation-library): ≥ 0; < 16.1.4 (affected, semver); 16.1.4 (unaffected, semver). Source: CNA: VulnCheck
- OpenIdentityPlatform / OpenAM (org.openidentityplatform.openam/openam-auth-saml2): ≥ 0; < 16.1.4 (affected, semver); 16.1.4 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.3 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 9.3 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.56% as of 2026-11-09; percentile 46.85%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-290

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-3j2f-qhrc-rjfj (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/openam-before-16.1.4-saml-authentication-bypass-via-unsigned-assertions (CNA: VulnCheck; third-party-advisory)

- https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-3j2f-qhrc-rjfj (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/openam-before-16.1.4-saml-authentication-bypass-via-unsigned-assertions (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-123550; retrieved 2026-11-09; source updated 2026-11-09

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123550; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-123550; retrieved 2026-11-09; source updated Not reported

Revision: 61381b063c291fef00a51c635bdc38ec05ae6891619602f805fb70a1586ed47b

Canonical: https://y2.dev/cve/CVE-2026-123550

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