What is CVE-2026-123550?

CVE-2026-123550 is a critical-severity vulnerability in Openidentityplatform Openam, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-11-08.

How severe is CVE-2026-123550?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Openidentityplatform Openam

CVE-2026-123550

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.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Openidentityplatform Openam

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

GitHub Security Advisory (GHSA-3j2f-qhrc-rjfj) (vendor-advisory)
VulnCheck Advisory: OpenAM before 16.1.4 SAML Authentication Bypass via Unsigned Assertions (third-party-advisory)

Frequently asked questions

What is CVE-2026-123550?: CVE-2026-123550 is a critical-severity vulnerability in Openidentityplatform Openam, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-11-08.
How severe is CVE-2026-123550?: Critical severity. CVSS v3 base score is 9.8 out of 10.