The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator() attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a validator that delegates to the outer message and is later checked against metadata selected from the embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns normally when the TLS public key does not match the key being validated, and SAML2\Message::validate() treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions     4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML     Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator()     attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a     validator that delegates to the outer message and is later checked against metadata selected from the     embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns     normally when the TLS public key does not match the key being validated, and SAML2\Message::validate()     treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or     lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a     higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion     attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.
    (CVE-2026-49283)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions
    4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML
    Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator()
    attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a
    validator that delegates to the outer message and is later checked against metadata selected from the
    embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns
    normally when the TLS public key does not match the key being validated, and SAML2\Message::validate()
    treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or
    lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a
    higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion
    attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.
    (CVE-2026-49283)

ID	Name	Product	Family	Type	Severity
338300	Linux Distros Unpatched Vulnerability : CVE-2026-49283	Nessus	Misc.	Local	high
445680	SCA: security update for simplesamlphp/saml2, simplesamlphp/saml2-legacy (GHSA-6929-8p9f-26jx)	Tenable Cloud Security	SCA Checks	Local	high
445680	SCA: security update for simplesamlphp/saml2, simplesamlphp/saml2-legacy (GHSA-6929-8p9f-26jx)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-49283

high

Tenable Plugins

high

high

high