CVE-2026-119479 in JetFormBuilder Plugin
Summary
by MITRE • 10/30/2026
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Crocoblock JetFormBuilder jetformbuilder allows Code Injection.This issue affects JetFormBuilder: from n/a through 3.6.7.1.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 10/30/2026
The identified vulnerability represents a classic Cross-Site Scripting flaw, specifically categorized under CWE-80 as Improper Neutralization of Script-Related HTML Tags in a Web Page. This security defect resides within the Crocoblock JetFormBuilder plugin for WordPress, affecting versions ranging from its initial release through version 3.6.7.1. The core technical issue stems from insufficient input validation and output encoding mechanisms when processing user-supplied data that is subsequently rendered into HTML contexts without adequate sanitization. This oversight allows an attacker to inject malicious script tags or event handlers directly into the web page content, bypassing standard browser security policies such as the Same-Origin Policy because the injected code executes within the context of the trusted domain hosting the vulnerable application.
From a technical perspective, this vulnerability enables Code Injection by exploiting the lack of proper neutralization of special characters that have meaning in HTML and JavaScript contexts. When a user submits form data containing script payloads, the application fails to escape or strip these elements before rendering them back to other users viewing the page. Consequently, any visitor loading the affected page will inadvertently execute the attacker-controlled scripts within their own browser session. This execution environment grants the malicious code full access to cookies, local storage, and potentially sensitive form data entered by legitimate users, facilitating a wide range of downstream attacks including session hijacking, credential theft, and defacement of the website interface.
The operational impact of this vulnerability is significant for both site administrators and end-users. For attackers, it provides a reliable vector for delivering phishing campaigns or deploying further malware via drive-by downloads if combined with other exploits. The ability to execute arbitrary JavaScript means that an attacker can manipulate the DOM (Document Object Model) dynamically, altering page content, redirecting users to malicious sites, or stealing sensitive information such as login credentials and personal data submitted through forms. This compromises the confidentiality, integrity, and availability of the web application's data and functionality, eroding user trust and potentially violating regulatory compliance standards regarding data protection.
In terms of threat modeling, this vulnerability aligns with MITRE ATT&CK technique T1059.007, which covers JavaScript execution within a browser environment. It also relates to CWE-79, the broader category for Cross-Site Scripting vulnerabilities where input is not validated against acceptable values before being included in web content. The attack typically requires social engineering or prior access to create posts or comments if administrative privileges are needed to inject persistent payloads, though reflected variants may be triggered via crafted URLs shared with victims.
Mitigation strategies must focus on immediate remediation and long-term defensive coding practices. Administrators should upgrade JetFormBuilder to a version later than 3.6.7.1 where the vendor has presumably patched this input validation gap. In cases where upgrading is not immediately feasible, implementing Web Application Firewall rules that detect and block common script injection patterns can provide temporary protection. Furthermore, developers must enforce strict output encoding using context-aware methods such as HTML entity encoding for data rendered in HTML bodies or attribute contexts, and JavaScript escaping for dynamic content insertion. Adopting Content Security Policy headers can also mitigate the impact by restricting the sources from which scripts are allowed to execute, thereby reducing the effectiveness of injected payloads even if they bypass input filters.