CVE-2025-3529 Overview
CVE-2025-3529 affects the WordPress Simple Shopping Cart plugin (also known as WordPress Simple PayPal Shopping Cart) in all versions up to and including 5.1.2. The flaw is a sensitive information exposure issue [CWE-201] in the file_url parameter handled by the plugin's related-products shortcode. Unauthenticated attackers can retrieve the protected download URL of a digital product and obtain the file without completing a purchase. The vulnerability impacts site operators who sell paid digital downloads through the plugin, resulting in revenue loss and disclosure of files intended for paying customers only.
Critical Impact
Unauthenticated remote attackers can download paid digital products and expose protected file_url values across every site running the plugin at or below version 5.1.2.
Affected Products
- WordPress Simple Shopping Cart plugin (wordpress-simple-paypal-shopping-cart) versions up to and including 5.1.2
- WordPress sites using the plugin's related-products shortcode for digital downloads
- Tips and Tricks HQ ecommerce deployments relying on file_url for paid content delivery
Discovery Timeline
- 2025-04-23 - CVE-2025-3529 published to the National Vulnerability Database
- 2026-04-15 - Last updated in NVD database
Technical Details for CVE-2025-3529
Vulnerability Analysis
The plugin renders related-product information through the shortcode logic located in includes/wpsc-shortcodes-related.php. During rendering, the file_url attribute associated with a digital product is exposed to clients without verifying purchase status or session ownership. An unauthenticated attacker can request a page that triggers the shortcode and read the disclosed URL directly from the response. The disclosed URL then permits the attacker to fetch the underlying digital asset, bypassing the payment workflow the plugin is designed to enforce.
Root Cause
The root cause is improper output filtering of sensitive product metadata [CWE-201]. The shortcode emits the raw file_url value during related-product rendering rather than restricting that attribute to authenticated, paying buyers. No access control, nonce verification, or session check gates the disclosure path.
Attack Vector
Exploitation requires only network access to a vulnerable WordPress site. An attacker browses any page or post containing the related-products shortcode, parses the rendered HTML, and extracts the file_url value. The attacker then issues an HTTP GET to that URL and downloads the digital product. No authentication, user interaction, or elevated privileges are required.
A technical reference for the vulnerable code path is available in the WordPress Plugin Code Reference.
Detection Methods for CVE-2025-3529
Indicators of Compromise
- HTTP responses from WordPress pages containing the related-products shortcode that include a file_url attribute in the rendered HTML or page source.
- Unusual unauthenticated GET requests directly targeting digital asset paths referenced by the plugin's file_url values.
- Spikes in downloads of paid digital products without corresponding PayPal transaction records.
Detection Strategies
- Inspect rendered output of pages embedding the WordPress Simple Shopping Cart related-products shortcode for exposed file_url strings.
- Correlate web server access logs for direct requests to digital download paths against the merchant's order database to find unmatched downloads.
- Run version checks against installed WordPress plugins and flag wordpress-simple-paypal-shopping-cart instances at or below 5.1.2.
Monitoring Recommendations
- Enable WordPress audit logging to capture shortcode rendering and direct file requests.
- Monitor outbound bandwidth on digital asset directories for anomalous download volume from a single IP or user agent.
- Alert on repeated 200 responses to URIs containing known digital product file extensions when no order ID is present in the session.
How to Mitigate CVE-2025-3529
Immediate Actions Required
- Update the WordPress Simple Shopping Cart plugin to the version released after 5.1.2 containing the fix referenced in WordPress Changeset 3275373.
- Rotate or relocate digital product files that may have been disclosed, and issue new URLs to legitimate customers.
- Review web server logs since the plugin was installed for unauthorized downloads of paid assets.
Patch Information
The plugin maintainers addressed the disclosure in the changeset published at WordPress Changeset 3275373. Site administrators should upgrade via the WordPress plugin installer or download the latest release from the WordPress Plugin Developer Info page. Additional vendor context is available in the Wordfence Vulnerability Report.
Workarounds
- Remove the related-products shortcode from public pages until the plugin is updated.
- Move digital product files to access-controlled storage and serve them through authenticated, signed URLs rather than static file_url paths.
- Restrict access to the WordPress site at the web application firewall layer to block requests that return file_url patterns in responses.
# Configuration example
wp plugin update wordpress-simple-paypal-shopping-cart
wp plugin get wordpress-simple-paypal-shopping-cart --field=version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
