Executive Summary

The Filestack plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in its 'filepicker' shortcode in all versions up to and including 2.0.8.

This vulnerability arises because the plugin does not properly sanitize or escape user-supplied attributes, allowing authenticated users with contributor-level access or higher to inject malicious web scripts.

These injected scripts are stored and executed whenever any user accesses the affected page, potentially compromising user security.

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Impact Analysis

This vulnerability can allow an attacker with contributor-level access or higher to inject malicious scripts into pages viewed by other users.

When other users visit these pages, the malicious scripts execute in their browsers, which can lead to theft of sensitive information, session hijacking, or other malicious actions.

Because the vulnerability requires authenticated access, it primarily impacts sites where multiple users have contributor or higher privileges.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

The vulnerability exists in all versions of the Filestack plugin for WordPress up to and including 2.0.8 due to insufficient input sanitization and output escaping on user supplied attributes in the 'filepicker' shortcode.

Immediate mitigation steps include updating the plugin to a version later than 2.0.8 where the vulnerability is fixed, or if an update is not available, disabling or removing the Filestack plugin to prevent exploitation.

Additionally, restrict contributor-level access and above to trusted users only, as the vulnerability requires authenticated contributor-level access or higher to exploit.

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