What is CVE-2022-31158?

CVE-2022-31158 is a high-severity vulnerability in Packback Lti 1.3 Tool Library, classified under Authentication Bypass by Capture-replay. CVSS score: 7.5/10. Published 2022-07-15.

How severe is CVE-2022-31158?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Packback Lti 1.3 Tool Library

CVE-2022-31158

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.

Published 2022-07-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.001

Affected products

Packback Lti 1.3 Tool Library
Packbackbooks Lti-1-3-Php-Library — versions < 5.0

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay

References

github.com/packbackbooks/lti-1-3-php-library/security/advisories/GHSA-5p73-qg2v… (Third Party Advisory)

Frequently asked questions

What is CVE-2022-31158?: CVE-2022-31158 is a high-severity vulnerability in Packback Lti 1.3 Tool Library, classified under Authentication Bypass by Capture-replay. CVSS score: 7.5/10. Published 2022-07-15.
How severe is CVE-2022-31158?: High severity. CVSS v3 base score is 7.5 out of 10.