CVE-2026-74252
Received Received - Intake

Stored XSS in J2Store Joomla Extension

Publication date: 2026-08-21

Last updated on: 2026-08-21

Assigner: Joomla! Project

Description
Joomla Extension - j2commerce.com - Stored XSS in Guest checkout in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5 - J2Commerce 4.1.5 is vulnerable to Stored Cross-Site Scripting (XSS) through the guest checkout billing address fields. An unauthenticated attacker exploits a filter bypass in Joomla's Input::getArray() combined with PHP's variables_order=EGPCS (Cookie overrides POST in $_REQUEST ) to store unsanitized HTML in fields such as billing_first_name.

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Meta Information

Published
2026-08-21
Last Modified
2026-08-21
Generated
2026-08-22
AI Q&A
2026-08-21
EPSS Evaluated
N/A
NVD
CVE-2026-74252
EUVD
EUVD-2026-64063

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
j2commerce j2store From 1.0.0 (inc) to 3.3.20 (inc)
j2commerce j2store From 4.0.0 (inc) to 4.0.20 (inc)
j2commerce j2store From 4.1.0 (inc) to 4.1.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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.

Attack-Flow Graph

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the J2Store Joomla extension versions 1.0.0-3.3.20, 4.0.0-4.0.20, and 4.1.0-4.1.5. An unauthenticated attacker can exploit a filter bypass in Joomla's Input::getArray() function combined with PHP's variables_order=EGPCS setting to inject unsanitized HTML into guest checkout billing address fields, such as billing_first_name.

Detection Guidance

Check Joomla sites running J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, or 4.1.0-4.1.5 for guest checkout billing address fields containing unsanitized HTML or JavaScript. Inspect POST requests to /index.php?option=com_j2store&task=checkout.save to see if billing_first_name or similar fields accept raw input.

Impact Analysis

An attacker could exploit this to store malicious scripts on the website. When other users view the affected pages, the stored script executes in their browsers, potentially stealing session cookies, redirecting to phishing sites, or performing actions on behalf of the user without their consent.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations could face compliance violations, fines, or reputational damage if user data is compromised through this exploit.

Mitigation Strategies

Upgrade J2Store to the latest patched version immediately. Temporarily disable guest checkout if an update is not available. Review and sanitize all user input fields in Joomla components, especially billing addresses. Monitor for suspicious activity in checkout forms.

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