Authorization Bypass in Fluent Forms Signature Add-on

Executive Summary

This vulnerability is an Authorization Bypass Through User-Controlled Key, specifically an Insecure Direct Object References (IDOR) issue in the WP E-Signature Electronic Signature Add-on for Fluent Forms. Attackers can manipulate IDs in URLs to access unauthorized data without proper authorization checks.

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Detection Guidance

To detect this vulnerability, monitor for unusual access patterns or unauthorized data retrieval attempts in your WordPress logs. Check for requests manipulating IDs in URLs, especially targeting the Electronic Signature Add-on for Fluent Forms. Use tools like grep to search logs for suspicious patterns such as 'id=' or 'user_id=' in requests to the plugin's endpoints.

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Impact Analysis

Attackers could exploit this to access sensitive data or perform unauthorized actions by changing IDs in URLs. The risk is moderate with a CVSS score of 7.5, and the vulnerability is actively exploitable, potentially affecting many websites.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate GDPR's data protection principles if personal data is exposed. For HIPAA, it risks breaching protected health information confidentiality if electronic signatures relate to health records.

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Mitigation Strategies

Immediately update the Electronic Signature Add-on for Fluent Forms to version 2.0.6 or later. Apply Patchstack's provided mitigation rule to block attacks until the update is complete. Review access logs for signs of exploitation and restrict unnecessary user permissions.

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