J2Commerce J2Store Extension 1.0.0-3.3.21/4.0.0-4.0.21/4.1.0-4.1.6 Task filter_tag/pricefrom/priceto cross site scripting

Summaryinfo

A vulnerability was found in J2Commerce J2Store Extension 1.0.0-3.3.21/4.0.0-4.0.21/4.1.0-4.1.6. It has been declared as problematic. The affected element is an unknown function of the component Task Handler. Executing a manipulation of the argument filter_tag/pricefrom/priceto can lead to cross site scripting. The identification of this vulnerability is CVE-2026-78000. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in J2Commerce J2Store Extension 1.0.0-3.3.21/4.0.0-4.0.21/4.1.0-4.1.6. This vulnerability affects some unknown processing of the component Task Handler. The manipulation of the argument filter_tag/pricefrom/priceto with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

Joomla Extension - j2commerce.com - Reflected XSS via `filter_tag`, `pricefrom` and `priceto` in J2Store 1.0.0-3.3.21, 4.0.0-4.0.21, 4.1.0-4.1.6 - Four task handlers accepted a base64-encoded URL from user input and redirected to it without validating the destination host, enabling phishing using the shop's trusted domain. No authentication required.

The advisory is shared for download at j2commerce.com. This vulnerability was named CVE-2026-78000 since 08/21/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. 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.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• J2Commerce

Name

• J2Store Extension

Version

• 1.0.0-3.3.21
• 4.0.0-4.0.21
• 4.1.0-4.1.6

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