Compliance Impact

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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Executive Summary

The Post Snippets plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to 4.0.19. This occurs because the plugin does not properly escape snippet content when embedding it into JavaScript variables in the post editor. Specifically, the method jqueryUiDialog() in the WPEditor.php file inserts snippet content directly into JavaScript string literals without escaping double quotes, allowing malicious scripts to be injected.

When snippets are imported using the Import/Export feature, the content bypasses WordPress's protective mechanism (wp_magic_quotes), enabling attackers with Administrator-level access to inject arbitrary scripts via a malicious import file. These scripts execute whenever an administrator accesses the post editor page.

This vulnerability does not affect single-site installations because administrators there already have the unfiltered_html capability, which mitigates this issue.

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Impact Analysis

This vulnerability allows authenticated attackers with Administrator-level access to inject and execute arbitrary JavaScript code in the post editor page. This can lead to unauthorized actions such as stealing sensitive information, performing actions on behalf of administrators, or compromising the integrity of the WordPress site.

Because the malicious script executes in the context of the administrator's browser, it can bypass normal security controls and potentially lead to further compromise of the website or its data.

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Mitigation Strategies

To mitigate this vulnerability, ensure that you update the Post Snippets plugin for WordPress to a version later than 4.0.19 where the issue is fixed.

Additionally, restrict import of snippet content to trusted administrators only, as exploitation requires Administrator-level access.

Avoid using the Import/Export feature with untrusted snippet files to prevent injection of malicious scripts.

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