CVE-2026-93836: WPC Product Bundles for WooCommerce <= 8.6.6 - Unauthenticated Stored Cross-Site Scripting via 'qty' Parameter
The WPC Product Bundles for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'qty' parameter in all versions up to, and including, 8.6.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The float cast used during quantity validation allows a numeric-prefixed payload such as '1<img src=x onerror=...>' to pass validation while retaining its malicious HTML, which is then stored verbatim in order item metadata under the 'woosbids' key.
Affected Software
Event History
Frequently Asked Questions
Which installations are exposed?
WordPress sites using WPC Product Bundles for WooCommerce versions up to and including 8.6.6 are affected.
Does exploitation require an attacker account or user interaction?
No attacker authentication is required. The injected script executes when a user accesses a page containing the stored malicious content.
How can I check for possible exploitation?
Review order item metadata for the _woosb_ids key, particularly for quantity values containing HTML or numeric-prefixed strings such as 1<img src=x onerror=...>. Malicious content is stored verbatim in this metadata.