CVE-2016-9814: Simplesamlphp SAML2

Critical severity, CVSS 9.1. EPSS: 2.4% chance of exploitation in the next 30 days.

The validateSignature method in the SAML2\Utils class in SimpleSAMLphp before 1.14.10 and simplesamlphp/saml2 library before 1.9.1, 1.10.x before 1.10.3, and 2.x before 2.3.3 allows remote attackers to spoof SAML responses or possibly cause a denial of service (memory consumption) by leveraging improper conversion of return values to boolean.

Affected products

• Simplesamlphp SAML2: up to and including 1.9; version 1.10 only; version 1.10.1 only; version 1.10.2 only; version 2.0.0 only; version 2.0.1 only; …
• Simplesamlphp Simplesamlphp: up to and including 1.14.9; version 1.10 only

Published 2017-02-17. Last modified 2026-06-17.