FV Flowplayer Video Player Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the FV Flowplayer Video Player plugin for WordPress, affecting all versions through 7.5.49.7212. The issue arises from inadequate input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary web scripts into comments. These scripts are executed when users access the affected pages. Exploitation requires the 'Parse Vimeo and YouTube links' setting to be enabled and for the injected comment to be approved by an administrator before the script is executed publicly.

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.

Reproduction

To reproduce this vulnerability, first ensure that the FV Flowplayer Video Player plugin is installed and activated on a WordPress site. Then, enable the 'Parse Vimeo and YouTube links' setting in the plugin's configuration. Next, submit a comment containing a script payload. This comment must be approved by an administrator before the script will execute when the page is viewed.

Remediation

Users are advised to update the FV Flowplayer Video Player plugin to version 7.5.50.7212 or later.