EUVD-2026-23889
GHSA-fg79-cr9c-7369
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
7DescriptionGitHub Advisory
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.
AnalysisAI
Remote code execution in OpenMage Magento LTS versions prior to 20.17.0 allows unauthenticated attackers to execute arbitrary code by uploading malicious phar archives disguised as images and triggering PHP deserialization via phar:// stream wrappers. The attack requires high complexity (AC:H) to exploit successfully. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the OpenMage instance exposes file upload functionality (product images, customer avatars, CMS media uploads, or import/export features) where phar archives can be stored on the server filesystem with attacker-controlled or predictable paths. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite the critical CVSS score of 8.1, real-world exploitation risk depends heavily on deployment specifics. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies an OpenMage storefront allowing product image uploads or customer profile pictures without authentication. They craft a malicious phar archive containing serialized PHP objects with gadget chains targeting known classes in OpenMage or installed plugins. … |
| Remediation | Upgrade immediately to OpenMage Magento LTS version 20.17.0 or later, available at https://github.com/OpenMage/magento-lts/releases/tag/v20.17.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all OpenMage Magento LTS installations and document current versions. …
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