{"id":"CVE-2026-123538","title":"OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation","summary":"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, suc…","severity":"medium","cvss":6.6,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-347"],"vendor":"OpenIdentityPlatform","product":"OpenAM","affected":["OpenAM < 16.1.4"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:37:45.221Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123538","references":[{"url":"https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-j56q-q3r3-hg7f","label":"GitHub Security Advisory (GHSA-j56q-q3r3-hg7f)"},{"url":"https://www.vulncheck.com/advisories/openam-before-16.1.4-saml-1-x-signature-verification-issuer-impersonation","label":"VulnCheck Advisory: OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.681Z","slug":"CVE-2026-123538","body":"## Overview\n\nOpenAM 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.\n\n## Affected\n\n- `OpenAM < 16.1.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":36.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}