CVE-2026-123538

MEDIUM 6.6

OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation

CVSS Score

6.6

EPSS Score

0.0%

EPSS Percentile

0th

OpenAM before 16.1.4 does not verify that a signed SAML 1.x assertion or response was signed by the partner named as its issuer, accepting a signature from any certificate in OpenAM's keystore. An attacker holding such a private key, such as a trusted SAML 1.x partner, can forge assertions claiming another partner's issuer and sign in as that partner's users, including privileged ones.

CWE	CWE-347
Vendor	openidentityplatform
Product	openam
Published	Nov 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

OpenIdentityPlatform / OpenAM

0 < 16.1.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-j56q-q3r3-hg7f vulncheck.com: https://www.vulncheck.com/advisories/openam-before-16.1.4-saml-1-x-signature-verification-issuer-impersonation

Credits

🔍 isazajuancarlos vharseko maximthomas tsujiguchitky