CVE-2025-3890: WordPress Simple PayPal Shopping Cart <= 5.1.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
Description
The WordPress Simple Shopping Cart plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'wp_cart_button' shortcode in all versions up to, and including, 5.1.3 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Classification
CVE ID: CVE-2025-3890
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.4
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Problem Types
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Affected Products
Vendor: mra13
Product: WordPress Simple Shopping Cart
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.03% (probability of being exploited)
EPSS Percentile: 7.56% (scored less or equal to compared to others)
EPSS Date: 2025-05-30 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: none
SSVC Technical Impact: partial
SSVC Automatable: false
References
https://nvd.nist.gov/vuln/detail/CVE-2025-3890https://www.wordfence.com/threat-intel/vulnerabilities/id/93898bf8-cfed-44bf-9d68-a0167beba86a?source=cve
https://plugins.trac.wordpress.org/browser/wordpress-simple-paypal-shopping-cart/tags/5.1.2/includes/wpsc-shortcodes-related.php#L20
https://www.tipsandtricks-hq.com/ecommerce/simple-wp-shopping-cart-installation-usage-290#step-1-inserting-an-add-to-cart-button
https://plugins.trac.wordpress.org/changeset/3284572/