Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to version 20.17.0, PHP functions such as `getimagesize()`, `file_exists()`, and `is_readable()` can trigger deserialization when processing `phar://` stream wrapper paths. OpenMage LTS uses these functions with potentially controllable file paths during image validation and media handling. An attacker who can upload a malicious phar file (disguised as an image) and trigger one of these functions with a `phar://` path can achieve arbitrary code execution. Version 20.17.0 patches the issue.
Fix
Public exploits 1
- Emily-0309/unit-01-severity-vs-risk-reflection PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
Patch, vendor advisory and mitigation references on NVD 1
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-fg79-cr9c-7369 Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.1 · openmageNVD modified 2026-10-26 21:10
Affected (CPE criteria) 1
cpe:2.3:a:openmage:magento:*:*:*:*:lts:*:*:*
References 2
- https://github.com/OpenMage/magento-lts/releases/tag/v20.17.0 Release Notes
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-fg79-cr9c-7369 Exploit, Mitigation, Vendor Advisory