CVE-2017-12868: Simplesamlphp

Critical severity, CVSS 9.8. EPSS: 2.1% chance of exploitation in the next 30 days.

The secureCompare method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.13 and earlier, when used with PHP before 5.6, allows attackers to conduct session fixation attacks or possibly bypass authentication by leveraging missing character conversions before an XOR operation.

Affected products

• Simplesamlphp Simplesamlphp: up to and including 1.14.13

Published 2017-09-01. Last modified 2026-06-17.