The Welcart e-Commerce plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) via the 'name' parameter in all versions up to 2.11.9. Due to inadequate input validation and output escaping, attackers can inject malicious scripts that persist in the application and execute in the context of users visiting the affected pages. This vulnerability does not require authentication and has a CVSS 3.1 base score of 7.2, reflecting its potential to impact confidentiality and integrity. No patch or vendor advisory has been provided, and it is not a cloud service, so remediation depends on plugin updates from the vendor.

Successful exploitation allows unauthenticated attackers to inject and execute arbitrary JavaScript in the browsers of users visiting affected pages. This can lead to theft of sensitive information such as cookies or session tokens, user impersonation, or other malicious actions performed in the context of the victim user. The vulnerability impacts confidentiality and integrity but does not affect availability. There are no known exploits in the wild currently.

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 restricting use of the affected plugin versions. Applying web application firewall (WAF) rules to detect and block suspicious input targeting the 'name' parameter may provide temporary mitigation. Monitor vendor channels for updates and apply patches promptly once available.