CVE-2026-0749 in Form Builder
Summary
by MITRE • 01/28/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Drupal Form Builder allows Cross-Site Scripting (XSS).This issue affects Drupal: from 7.X-1.0 through 7.X-1.22.
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Analysis
by VulDB Data Team • 03/09/2026
This vulnerability represents a classic cross-site scripting flaw that exploits improper input sanitization during web page generation within the Drupal Form Builder module. The weakness stems from the module's failure to adequately neutralize user-supplied input before incorporating it into dynamically generated web pages, creating an avenue for malicious actors to inject arbitrary JavaScript code. The vulnerability specifically impacts Drupal versions ranging from 7.X-1.0 through 7.X-1.22, indicating a sustained issue that affected multiple releases within the Drupal 7 ecosystem. This type of vulnerability falls under CWE-79 which categorizes improper neutralization of input during web page generation as a primary concern for web application security.
The technical execution of this XSS attack occurs when untrusted input data from users is processed and rendered within the web interface without proper sanitization measures. Attackers can craft malicious payloads that, when submitted through form fields or other input mechanisms, get stored or directly rendered in the web page context. This allows for the execution of arbitrary scripts in the victim's browser, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability's impact is particularly concerning within the Drupal environment as it affects the core form building functionality that many sites rely upon for user interactions and data collection.
From an operational perspective, this vulnerability presents significant risks to organizations using affected Drupal versions, as it enables attackers to exploit user sessions and potentially gain unauthorized access to sensitive information. The attack surface expands when considering that form builders are commonly used for user registration, contact forms, and administrative interfaces where users might submit data that gets rendered back to other users. The vulnerability's persistence across multiple minor versions suggests that it may have been overlooked during security reviews or that the fix was not properly implemented in all release cycles. This type of vulnerability aligns with ATT&CK technique T1531 which focuses on credential access through web application vulnerabilities, and T1211 which addresses lateral movement through compromised web applications.
Organizations should prioritize immediate remediation by upgrading to Drupal versions that contain proper XSS mitigation measures and ensuring that all input validation and sanitization procedures are properly implemented. The recommended mitigations include implementing proper output encoding for all user-supplied data, utilizing Drupal's built-in sanitization functions, and conducting regular security audits of form processing components. Additionally, implementing content security policies and input validation at multiple layers can provide defense-in-depth measures against similar vulnerabilities. Security teams should also consider monitoring for exploitation attempts and implementing web application firewalls to detect and block malicious payloads targeting this specific vulnerability. The vulnerability demonstrates the critical importance of proper input validation and output encoding practices in web application development, aligning with security standards that emphasize the need for comprehensive protection against injection attacks across all application components.