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SimpleSAMLphp SAML2 (5.0.0-5.0.5)

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high advisory

SimpleSAMLphp HTTP-Artifact Authentication Bypass via TLS Validator Confusion (CVE-2026-49283)

A critical vulnerability (CVE-2026-49283) in SimpleSAMLphp's HTTP-Artifact receive path allows a malicious or lower-trust Identity Provider (IdP) to bypass authentication and impersonate users from a higher-trust IdP by leveraging a flaw where `SOAPClient::validateSSL()` fails to properly validate TLS public keys for unsigned SAML Responses.

SimpleSAMLphp SAML2 +3 vulnerability saml authentication-bypass identity-federation
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