Vulnerability · Published Apr 20, 2026 · Assigned by GitHub_M
CVE-2026-25524OpenMage LTS's Phar Deserialization leads to Remote Code Execution
High 8.1
In plain English
A high-severity unsafe deserialization in magento-lts from OpenMage. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | openmage/magento-lts | 20.17.0 | GHSA-fg79-cr9c-7369 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenMage | magento-lts | < 20.17.0 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-fg79-cr9c-7369 x_refsource_CONFIRM
- https://github.com/OpenMage/magento-lts/releases/tag/v20.17.0 x_refsource_MISC