CVE-2025-56590
📋 TL;DR
This vulnerability in Apryse HTML2PDF SDK allows attackers to execute arbitrary operating system commands on servers using the InsertFromURL() function. It affects all systems running Apryse HTML2PDF SDK through version 11.10. This is a critical remote code execution vulnerability with a CVSS score of 9.8.
💻 Affected Systems
- Apryse HTML2PDF SDK
📦 What is this software?
Html2pdf by Apryse
Html2pdf by Apryse
Html2pdf by Apryse
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing attackers to install malware, steal data, pivot to other systems, and establish persistent access.
Likely Case
Server takeover leading to data exfiltration, ransomware deployment, or use as a foothold for lateral movement within the network.
If Mitigated
Limited impact if proper network segmentation, least privilege, and input validation are in place, though RCE remains dangerous.
🎯 Exploit Status
The vulnerability is an OS command injection (CWE-78) that requires no authentication and has simple exploitation vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.11 or later
Vendor Advisory: http://apryse.com
Restart Required: Yes
Instructions:
1. Check current Apryse HTML2PDF SDK version. 2. Upgrade to version 11.11 or later. 3. Restart all services using the SDK. 4. Test functionality to ensure compatibility.
🔧 Temporary Workarounds
Disable InsertFromURL() Function
allRemove or disable usage of the vulnerable InsertFromURL() function in applications.
Modify application code to remove calls to InsertFromURL()
Input Validation and Sanitization
allImplement strict input validation and sanitization for all URL parameters passed to the SDK.
Implement parameter validation in application code before calling SDK functions
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems from critical assets.
- Deploy application firewalls (WAF) with command injection detection rules and monitor for exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check if your application uses Apryse HTML2PDF SDK version 11.10 or earlier and calls the InsertFromURL() function.Check Version:
Check application dependencies or SDK documentation for version information.Verify Fix Applied:
Verify the SDK version is 11.11 or later and test that InsertFromURL() functionality works without security issues.📡 Detection & Monitoring
Log Indicators:
- Unusual process executions from web application context
- Failed command injection attempts in application logs
- Unexpected system commands in URL parameters
Network Indicators:
- Outbound connections from web servers to unexpected destinations
- Command and control traffic patterns
SIEM Query:
source="web_server" AND (process_execution="cmd.exe" OR process_execution="/bin/sh") AND user="web_app_user"