CVE-2022-31158: Packback Lti 1.3 Tool Library

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

LTI 1.3 Tool Library is a library used for building IMS-certified LTI 1.3 tool providers in PHP. Prior to version 5.0, the Nonce Claim Value was not being validated against the nonce value sent in the Authentication Request. Users should upgrade to version 5.0 to receive a patch. There are currently no known workarounds.

Affected products

• Packback Lti 1.3 Tool Library: before 5.0.0 (fixed in 5.0.0)

Published 2022-07-15. Last modified 2026-06-17.