CVE-2026-107252 in MathJax Plugin
Summary
by MITRE • 10/30/2026
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal MathJax: LaTeX for Drupal allows Cross-Site Scripting (XSS). This issue affects MathJax: LaTeX for Drupal versions: from 0.0.0 to 4.1.2.
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Analysis
by VulDB Data Team • 10/30/2026
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 context of web application vulnerabilities. This specific vulnerability resides in the Drupal MathJax module, which is designed to render LaTeX mathematical expressions using the MathJax library directly within Drupal content. The issue affects versions ranging from 0.0.0 up through and including version 4.1.2. In these affected iterations, the module fails to adequately sanitize or validate user-supplied input before it is processed for rendering by the underlying JavaScript engine responsible for displaying mathematical formulas. This lack of rigorous input validation allows an attacker to inject malicious scripts that are subsequently executed in the context of a victim's browser session when they view content containing the crafted payload.
From a technical perspective, the root cause lies in how the module handles data passed from users or other modules into the rendering pipeline. When a user submits content that includes LaTeX syntax, the system is expected to parse this input and convert it into visual mathematical representations using MathJax. However, due to insufficient filtering mechanisms, certain inputs can bypass these checks if they contain executable JavaScript code disguised within or adjacent to valid LaTeX commands. Because Drupal modules often operate with varying levels of privilege depending on user roles, an attacker might exploit this by crafting a specific input string that triggers the execution of arbitrary client-side scripts. This execution occurs in the context of the trusted domain hosting the Drupal site, thereby granting the malicious script access to cookies, session tokens, and other sensitive data protected by same-origin policies.
The operational impact of this vulnerability is significant for any organization relying on Drupal MathJax for educational or technical content delivery where user-generated input is permitted. Successful exploitation allows attackers to perform actions such as stealing administrative credentials if an administrator views the maliciously crafted page, hijacking user sessions to impersonate legitimate users, defacing websites by altering displayed content, or redirecting victims to phishing sites designed to harvest further information. In environments where multiple users interact with shared mathematical resources, a single compromised input can lead to widespread compromise across all viewers of that specific piece of content. This undermines the integrity and confidentiality assurances provided by the web application framework and erodes trust in the platform's ability to protect user data.
To mitigate this risk, organizations running affected versions must prioritize immediate remediation efforts. The most effective solution is to upgrade the Drupal MathJax module to a version later than 4.1.2, where developers have presumably implemented stricter input sanitization and output encoding practices aligned with current security standards. For sites unable to update immediately due to compatibility constraints or testing requirements, administrators should implement compensating controls such as deploying Web Application Firewalls configured to detect and block common XSS patterns in POST requests containing LaTeX-like syntax. Additionally, enforcing strict Content Security Policy headers can help mitigate the impact of any successful injection by restricting the sources from which scripts are allowed to execute. Regular security audits and code reviews focusing on input validation logic within custom modules or contributed themes are also recommended to prevent similar flaws from persisting in related components.
This vulnerability aligns with CWE-79, which categorizes Improper Neutralization of Input During Web Page Generation as a critical class of web application weaknesses. It is further mapped to the MITRE ATT&CK framework under technique T1059, specifically Command and Scripting Interpretation via JavaScript execution in browser contexts. Understanding these mappings helps security teams contextualize the threat within broader attack vectors and ensures that defensive strategies address not just this specific instance but similar patterns of input handling failures across the organization's digital assets. Continuous monitoring for new advisories related to Drupal modules remains essential as attackers frequently adapt their techniques to bypass evolving defenses.