The PDF Invoices & Packing Slips for WooCommerce plugin suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Multiple parameters lack adequate sanitization and escaping, enabling unauthenticated attackers to inject arbitrary scripts. This vulnerability affects all versions up to 3.8.0 and can be exploited when a user accesses a page containing the injected payload. The CVSS v3.1 base score is 7.2, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impacts on confidentiality and integrity with scope change.

Successful exploitation allows unauthenticated attackers to execute arbitrary JavaScript in the context of affected users, potentially leading to data theft, session hijacking, or other malicious actions impacting confidentiality and integrity. There is no impact on availability reported. The vulnerability affects all users who access the injected pages, including administrators and customers of the WooCommerce plugin.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider disabling or limiting use of the affected plugin versions and monitor for updates from the vendor. Applying web application firewall (WAF) rules that detect and block XSS payloads may provide temporary mitigation.