Weaver Show Posts Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Weaver Show Posts plugin for WordPress, affecting all versions through 1.8.1. The issue arises from inadequate input sanitization and output escaping of user-supplied attributes, particularly in the 'add_class' parameter. This vulnerability allows authenticated attackers with Administrator-level access to inject arbitrary scripts into pages, which are executed when users access the affected pages. The vulnerability is most impactful in multisite installations where Administrators lack the unfiltered_html capability.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the page.

Remediation

No known patch is available. Users are advised to review the vulnerability details and consider uninstalling the affected plugin.