GHSA-46R4-F8GJ-XG56 The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding

Summary There's 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. I believe that it exists for v4 only. I have not yet developed a PoC. V5 is well designed and...