CVE-2026-96362 in Webform
Summary
by MITRE • 10/22/2026
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Webform allows Cross-Site Scripting (XSS). This issue affects Webform versions: from 0.0.0 to 6.2.12, from 6.3.0 to 6.3.1.
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Analysis
by VulDB Data Team • 10/22/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS within the Drupal ecosystem. Specifically, this vulnerability resides in the Webform module, which is one of the most widely used extensions for creating forms and surveys on Drupal-based websites. The issue affects versions ranging from 0.0.0 up to 6.2.12 and also impacts the subsequent release cycle from 6.3.0 through 6.3.1. This broad range indicates a persistent failure in input validation logic that has existed across multiple major iterations of the module, suggesting a fundamental architectural oversight rather than an isolated coding error introduced in a single patch.
From a technical perspective, this vulnerability allows attackers to inject malicious client-side scripts into web pages viewed by other users. When a user interacts with a Webform containing vulnerable fields, the application fails to properly sanitize or encode specific input data before rendering it back to the browser. Consequently, if an attacker can manipulate form inputs—either through direct submission of crafted payloads or via stored XSS vectors where malicious content is saved in the database—the injected script executes within the context of the victim's session. This execution environment grants the malicious code full access to cookies, local storage, and other sensitive data associated with the user's active login state on the Drupal site.
The operational impact of this vulnerability is severe due to its potential for privilege escalation and data theft. An attacker can exploit this flaw to steal administrative credentials by harvesting session tokens or cookies from users who have higher privileges than themselves. Furthermore, it enables phishing attacks where the victim is redirected to a malicious site mimicking the legitimate Drupal interface, leading to credential compromise. In more advanced scenarios, the vulnerability allows for keylogging, redirection of traffic to malware distribution sites, and defacement of the website's public-facing content. Because Webforms are often used in high-traffic areas or by non-technical users who may not recognize malicious links embedded within form submissions, the blast radius of this exploit can be significant across an organization’s digital infrastructure.
This vulnerability aligns with CWE-79, which defines Improper Neutralization of Input During Web Page Generation: Cross-site Scripting (XSS). It also maps to MITRE ATT&CK technique T1059, specifically sub-technique 007 for JavaScript execution on the client side. The attack vector typically falls under Initial Access or Execution phases depending on whether the payload is stored and triggered later or executed immediately upon form submission. Understanding these mappings helps security teams prioritize remediation efforts based on established industry frameworks that categorize risks by their impact on confidentiality, integrity, and availability.
To mitigate this risk, organizations running affected versions of Drupal Webform must apply the official patches released for versions 6.2.13 and later, or upgrade to version 6.4.0 which addresses these specific flaws in the subsequent release cycle. Immediate action is required as automated scanning tools frequently target known vulnerabilities in popular modules like Webform. Additionally, implementing a Content Security Policy (CSP) can provide an additional layer of defense by restricting the sources from which scripts are allowed to execute, thereby mitigating the impact even if input validation fails. Regular security audits and code reviews focusing on output encoding practices should be conducted to prevent similar issues in custom modules or future updates.