OpenMage Magento LTS up to 20.18.1/21.0.0-beta2 Error Page errors/processor.php cross site scripting

Summaryinfo

A vulnerability was found in OpenMage Magento LTS up to 20.18.1/21.0.0-beta2 and classified as problematic. This affects an unknown part of the file errors/processor.php of the component Error Page. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-128053. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in OpenMage Magento LTS up to 20.18.1/21.0.0-beta2. Affected is an unknown code of the file errors/processor.php of the component Error Page. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

OpenMage magento-lts before 20.18.2 and 21.0.0-beta1 before 21.0.0-beta3 contains a reflected cross-site scripting vulnerability in its error pages, which print SCRIPT_NAME-derived URLs built by errors/processor.php without escaping. Unauthenticated attackers can craft links that trigger uncaught exceptions on servers deriving SCRIPT_NAME from the request path, executing script in the storefront origin within victims' browsers.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-128053 since 11/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:errors/processor.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 20.18.2 or 21.0.0-beta3 eliminates this vulnerability.

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Productinfo

Type

• E-Commerce Management Software

Vendor

• OpenMage

Name

• Magento LTS

Version

• 20.18.0
• 20.18.1
• 21.0.0-beta1
• 21.0.0-beta2

License

• open-source

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