CVE-2026-15395 in Kali Forms Plugin
Summary
by MITRE • 07/17/2026
The Kali Forms — Contact Form & Drag-and-Drop Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'digitalSignature' Field Value in all versions up to, and including, 2.4.18 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The required form-submission nonce is publicly available on any page containing the form shortcode, making this exploitable by fully unauthenticated attackers without any precondition beyond the form being published.
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Analysis
by VulDB Data Team • 07/17/2026
The vulnerability identified in the Kali Forms plugin represents a critical stored cross-site scripting flaw that undermines the security posture of WordPress installations relying on this contact form solution. This weakness exists within the plugin's handling of the 'digitalSignature' field value, where insufficient input sanitization and output escaping mechanisms fail to properly validate or escape user-supplied data before it is stored in the database and subsequently rendered in web pages. The vulnerability affects all versions up to and including 2.4.18, making it a widespread concern for WordPress administrators who have not yet updated their installations.
The technical exploitation of this flaw occurs through the manipulation of the digitalSignature field during form submission, where malicious scripts can be embedded and stored within the plugin's database. When legitimate users access pages containing the compromised form data, these stored scripts execute in their browsers, creating a persistent threat vector that can compromise user sessions, steal sensitive information, or redirect users to malicious sites. The vulnerability's severity is amplified by the fact that the required form-submission nonce is publicly accessible on any page containing the form shortcode, eliminating the need for attackers to obtain authentication credentials or overcome additional security measures.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling sophisticated attack chains that leverage the compromised user sessions. Attackers can exploit this weakness to perform actions on behalf of authenticated users, steal cookies and session tokens, or manipulate form data to redirect submissions to malicious endpoints. The unauthenticated nature of the exploitation means that even users without administrative privileges or access credentials can compromise the plugin's functionality and potentially affect the broader WordPress installation. This vulnerability particularly impacts organizations relying on contact forms for customer interactions, as it creates opportunities for data exfiltration and service disruption.
Security best practices recommend immediate remediation through plugin updates to versions that address the input validation and output escaping deficiencies. Organizations should implement comprehensive monitoring of form submissions and user access logs to detect potential exploitation attempts. The vulnerability aligns with CWE-79 (Cross-site Scripting) and follows attack patterns documented in the ATT&CK framework under web application attacks, specifically targeting the execution of malicious code through user input manipulation. Additionally, implementing Content Security Policy headers and regular security audits of third-party plugins can help mitigate similar vulnerabilities in the broader WordPress ecosystem while maintaining compliance with industry standards for web application security management.