CVE-2025-65482: XDocReport XXE Vulnerability

CVE-2025-65482 Overview

An XML External Entity (XXE) vulnerability exists in opensagres XDocReport versions v0.9.2 through v2.0.3. This vulnerability allows attackers to execute arbitrary code by uploading a specially crafted .docx file. XDocReport is a Java library used for generating documents from templates, and this flaw stems from improper handling of XML content within document files.

Critical Impact

Attackers can achieve arbitrary code execution through malicious document uploads, potentially leading to complete system compromise, data exfiltration, and lateral movement within affected environments.

Affected Products

• opensagres XDocReport v0.9.2
• opensagres XDocReport v2.0.3
• All intermediate versions between v0.9.2 and v2.0.3

Discovery Timeline

• 2026-01-20 - CVE-2025-65482 published to NVD
• 2026-01-21 - Last updated in NVD database

Technical Details for CVE-2025-65482

Vulnerability Analysis

This vulnerability falls under CWE-611 (Improper Restriction of XML External Entity Reference). XDocReport processes .docx files, which are essentially ZIP archives containing XML documents. When the library parses these embedded XML files, it fails to properly disable external entity processing in the XML parser configuration.

The attack is network-accessible and requires no authentication or user interaction, making it particularly dangerous in environments where document processing is exposed to untrusted input. An attacker can craft a malicious .docx file containing XXE payloads within the document's XML components (such as document.xml, styles.xml, or other content parts). When XDocReport processes this file, the XML parser resolves the external entities, leading to arbitrary code execution.

Root Cause

The root cause is the insecure default configuration of the XML parser used by XDocReport when processing .docx file contents. The library does not disable DTD (Document Type Definition) processing or external entity resolution before parsing XML content from uploaded documents. This allows malicious external entity declarations to be processed, enabling attackers to reference external resources or execute system commands.

Attack Vector

The attack is executed via a network-accessible endpoint that accepts .docx file uploads for processing by XDocReport. The attacker crafts a malicious .docx file by modifying the internal XML structure to include XXE payloads. Common exploitation techniques include:

1. File Disclosure: Using external entities to read sensitive files from the server (e.g., /etc/passwd, configuration files)
2. Server-Side Request Forgery (SSRF): Forcing the server to make requests to internal or external resources
3. Remote Code Execution: In certain configurations, leveraging protocol handlers or chained vulnerabilities to achieve code execution

The vulnerability requires the attacker to upload or provide a crafted .docx file to an application using the vulnerable XDocReport library. Technical details and proof-of-concept materials are available through the GitHub PoC Repository and HackMD Security Documentation.

Detection Methods for CVE-2025-65482

Indicators of Compromise

• Unusual outbound network connections from document processing servers to external hosts
• Presence of .docx files with modified or suspicious XML content in upload directories
• Server logs showing attempts to access sensitive system files (e.g., /etc/passwd, /etc/shadow)
• XML parsing errors or exceptions related to DTD processing in application logs

Detection Strategies

• Monitor file upload endpoints for .docx files with unusual XML structures or DTD declarations
• Implement network egress monitoring to detect unexpected outbound connections during document processing
• Deploy endpoint detection solutions capable of identifying XXE exploitation patterns
• Review application logs for XML parser exceptions or warnings about external entity resolution

Monitoring Recommendations

• Enable verbose logging for document processing components to capture XML parsing events
• Configure intrusion detection systems (IDS) to alert on XXE-related network traffic patterns
• Implement file integrity monitoring on document processing servers
• Use SentinelOne's behavioral AI to detect anomalous process execution following document uploads

How to Mitigate CVE-2025-65482

Immediate Actions Required

• Upgrade XDocReport to a patched version if available from the official repository
• Implement input validation to reject .docx files from untrusted sources
• Configure XML parsers to disable DTD processing and external entity resolution
• Restrict network egress from document processing servers to prevent data exfiltration

Patch Information

Organizations should monitor the XDocReport GitHub repository for security updates addressing this vulnerability. Until a patch is available, implement the workarounds described below to reduce risk exposure.

Workarounds

• Disable external entity processing in XML parsers by setting XMLConstants.FEATURE_SECURE_PROCESSING to true
• Block DTD processing by configuring the parser feature http://apache.org/xml/features/disallow-doctype-decl to true
• Implement network segmentation to isolate document processing systems from sensitive internal resources
• Use application firewalls to inspect and sanitize uploaded document files before processing

# Java XML Parser Secure Configuration Example
# Add these settings to your XML parser initialization:
# factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
# factory.setFeature("http://xml.org/sax/features/external-general-entities", false);
# factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
# factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);