Postalicious WordPress Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Postalicious plugin for WordPress, affecting all versions up to and including 3.0.1. The issue arises from inadequate input sanitization and output escaping, allowing authenticated attackers with administrator-level permissions to inject arbitrary web scripts into pages. These scripts execute when a user accesses the compromised page. This vulnerability is present in multi-site installations where unfiltered_html has been disabled.

Impact

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

Reproduction

To reproduce this vulnerability, an authenticated user with administrator-level permissions can inject scripts into the admin settings of the Postalicious plugin. Once the scripts are saved, they will execute when the injected page is accessed by any user.

Remediation

No known patch is available. It is recommended to uninstall the affected plugin and find a replacement.