CVE-2026-42155: Magento LTS has Weak API Session ID — Predictable MD5 of Time-Derived Inputs

May 5, 2026

The XML-RPC / SOAP API session ID is generated using an outdated, time-based construction rather than a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG):

The XML-RPC / SOAP API session ID is generated using an outdated, time-based construction rather than a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG):

All inputs to the MD5 hash are time-derived and non-secure:

References

github.com/OpenMage/magento-lts
github.com/OpenMage/magento-lts/security/advisories/GHSA-2cwr-gcf9-pvxr
github.com/advisories/GHSA-2cwr-gcf9-pvxr
nvd.nist.gov/vuln/detail/CVE-2026-42155

Code Behaviors & Features

Detect and mitigate CVE-2026-42155 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →