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The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade simplesamlphp | May 12, 2025 | Mar 11, 2025 |
| Ubuntu | — | Upgrade simplesamlphpUpgrade simplesamlphp (Ubuntu Pro) | Sep 16, 2026 | Sep 15, 2026 |
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