OpenMage LTS is an e-commerce platform. Prior to versions 19.4.22 and 20.0.19, a layout block was able to bypass the block blacklist to execute remote code. Versions 19.4.22 and 20.0.19 contain a patch for this issue.
https://github.com/OpenMage/magento-lts/security/advisories/GHSA-5j2g-3ph4-rgvm
https://github.com/OpenMage/magento-lts/releases/tag/v20.0.19
https://github.com/OpenMage/magento-lts/releases/tag/v19.4.22
https://github.com/OpenMage/magento-lts/commit/06c45940ba3256cdfc9feea12a3c0ca56d23acf8