CVE-2026-74252
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
Joomla extension J2Store (versions 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5) 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.
Risk Assessment
An attacker can inject a persistent malicious script that will execute in the browsers of other users visiting the site, potentially leading to data theft or session hijacking.
Recommendation
It is recommended to update J2Store to the latest version that includes the fix and to implement additional input validation mechanisms.
Other vulnerabilities in J2Store
See all- CVE-2026-67362Medium
Joomla Extension - j2commerce.com - Open redirect in cart controller in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5 - 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.
- CVE-2026-67361Medium
Joomla Extension - j2commerce.com - Unauthenticated file upload with missing directory protection in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5 - The file upload endpoint accepted POST requests from unauthenticated visitors with no CSRF token. Compounding this, the installer manifest omitted the upload and invoices directories, causing fresh installs to deploy those directories without .htaccess/web.config protection, making uploaded files directly web-accessible.
- CVE-2026-67360Medium
Joomla Extension - j2commerce.com - Cross-customer order replication in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5 - An authenticated user could supply another customer's order_id to copy their cart contents and address data into the attacker's session. The CSRF token was validated but ownership was not checked.
- CVE-2026-67359High
Joomla extension J2Store (versions 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5) allows an unauthenticated visitor to supply any order_id as a query parameter to render the full checkout confirmation page for that order, including line items, prices, and totals.
- CVE-2026-67358Medium
Joomla Extension - j2commerce.com - Download quota manipulation in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5 - An authenticated user with a valid order token could increment the download limit counter on a download record belonging to a different order. The endpoint also lacked a CSRF token.
Original NVD description (English source)
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.