CVE-2026-11783 is a stored cross-site scripting vulnerability in the Dokan WooCommerce Multivendor Marketplace plugin for WordPress, affecting all versions up to 5.0.4. The flaw is due to improper neutralization of input during web page generation, specifically insufficient sanitization and escaping of the Product SKU field. Authenticated attackers with custom-level access or above can inject arbitrary JavaScript payloads that are stored and later executed in the context of users visiting pages where the injected SKU is displayed. The vulnerability is exploited via the store search widget, which inserts unescaped AJAX response HTML into the DOM using jQuery's .html() method, enabling script execution in users' browsers.

Successful exploitation allows attackers with custom-level access or higher to inject persistent malicious scripts that execute in the browsers of site visitors, including unauthenticated users. This can lead to information disclosure, session hijacking, or other client-side attacks. The CVSS 3.1 base score is 6.4 (medium severity), reflecting network attack vector, low attack complexity, required privileges, no user interaction, and partial confidentiality and integrity impact without availability impact.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict custom-level user privileges to trusted users only and consider disabling or limiting the use of the Product SKU field or the store search widget that processes SKU data. Monitor vendor channels for updates and apply patches promptly once released.