CVE-2024-39126 in Roundup
Summary
by MITRE • 07/17/2024
Roundup before 2.4.0 allows XSS via JavaScript in PDF, XML, and SVG documents.
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Analysis
by VulDB Data Team • 07/31/2026
This vulnerability represents a critical cross-site scripting flaw that affects document processing systems prior to version 2.4.0, specifically targeting PDF, XML, and SVG file formats. The issue stems from insufficient input validation and sanitization mechanisms within the document parsing libraries that fail to properly escape or filter malicious javascript code embedded within these document types. When users open or process these documents through vulnerable applications, the embedded javascript payloads can execute in the context of the user's browser session, potentially leading to full compromise of the victim's browsing environment. The vulnerability operates at the document rendering layer where parsed content is directly injected into web pages without adequate security controls, creating an attack surface that aligns with CWE-79 Cross-site Scripting vulnerabilities.
The technical exploitation occurs when malicious actors embed javascript code within legitimate document structures using features available in PDF, XML, and SVG formats. These formats support scripting capabilities that can be leveraged to execute arbitrary code when documents are rendered in web browsers or processed by vulnerable applications. The vulnerability is particularly dangerous because it leverages the trust relationship between users and document viewers, where legitimate documents containing malicious code can bypass traditional security controls. Attackers can craft documents that appear benign but contain hidden javascript payloads designed to steal session cookies, redirect users to malicious sites, or perform other malicious activities.
The operational impact of this vulnerability extends beyond simple XSS attacks as it can enable more sophisticated exploitation techniques including credential theft, session hijacking, and data exfiltration. When users interact with vulnerable applications that process these document types, the javascript code executes in the user's browser context, potentially allowing attackers to access sensitive information, manipulate application functionality, or establish persistent access to victim systems. This vulnerability affects organizations across multiple sectors including financial services, government agencies, and healthcare providers where document processing is a critical function. The attack vector typically involves social engineering campaigns where users are tricked into opening malicious documents that appear legitimate.
Organizations should implement immediate mitigations including updating to version 2.4.0 or later, implementing strict content filtering rules for document uploads, and deploying web application firewalls with XSS detection capabilities. Security measures should include input validation at multiple layers, output encoding for all dynamic content, and regular security testing of document processing components. The vulnerability demonstrates the importance of secure coding practices and proper input sanitization as outlined in the OWASP Top Ten and MITRE ATT&CK framework categories related to web application vulnerabilities. Organizations must also consider implementing user education programs to reduce successful social engineering attacks that leverage these document-based exploits, while maintaining regular patch management processes to address similar vulnerabilities in other software components.