Unauthenticated XSS in Calculated Fields Form

Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability affecting Calculated Fields Form plugin versions up to 5.5.1.1. It allows attackers to inject malicious scripts into web pages viewed by other users without needing authentication.

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Detection Guidance

To detect this XSS vulnerability in Calculated Fields Form <= 5.5.1.1, inspect WordPress sites for reflected or stored XSS payloads in input fields. Check for unusual JavaScript execution in browser console when submitting forms. Review server logs for suspicious input patterns.

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Impact Analysis

An attacker could steal user sessions, redirect users to malicious sites, or deface web pages. Users with admin privileges could be targeted to gain full control of the site.

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Compliance Impact

This XSS vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality requirements. For HIPAA, it may compromise protected health information integrity.

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Mitigation Strategies

Immediately update Calculated Fields Form to the latest version beyond 5.5.1.1. If updating is not possible, disable the plugin temporarily. Implement input validation and output encoding on all form fields. Use a web application firewall to block XSS attempts.

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