CVE-2026-2074
📋 TL;DR
This XXE vulnerability in O2OA allows attackers to read arbitrary files from the server by sending specially crafted XML payloads to the vulnerable endpoint. It affects O2OA installations up to version 9.0.0 that have the vulnerable component enabled. Remote attackers can exploit this without authentication to potentially access sensitive system files.
💻 Affected Systems
- O2OA
📦 What is this software?
O2oa by Zoneland
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through file disclosure leading to credential theft, lateral movement, and data exfiltration
Likely Case
Sensitive file disclosure including configuration files, credentials, and application data
If Mitigated
Limited impact with proper XML parsing configuration and input validation
🎯 Exploit Status
Public exploit available on GitHub, simple XXE payloads can be used
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - vendor unresponsive
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Consider upgrading to any version above 9.0.0 if available, or implement workarounds.
🔧 Temporary Workarounds
Disable vulnerable endpoint
allBlock or disable the /x_program_center/jaxrs/mpweixin/check endpoint
# Configure web server (nginx example):
location /x_program_center/jaxrs/mpweixin/check { deny all; }
# Configure application firewall to block POST to this path
Configure XML parser security
allDisable external entity processing in XML parsers
# Java example for DocumentBuilderFactory:
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setFeature("http://xml.org/sax/features/external-general-entities", false);
dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
🧯 If You Can't Patch
- Implement WAF rules to block XXE patterns in POST requests to vulnerable endpoint
- Restrict network access to O2OA instances using firewall rules
🔍 How to Verify
Check if Vulnerable:
Send a test XXE payload to http://[target]/x_program_center/jaxrs/mpweixin/check and check for file disclosureCheck Version:
Check O2OA version in web interface or configuration filesVerify Fix Applied:
Test with same XXE payload - should return error or no file content📡 Detection & Monitoring
Log Indicators:
- POST requests to /x_program_center/jaxrs/mpweixin/check with XML content
- XML parsing errors in application logs
- File read attempts in system logs
Network Indicators:
- HTTP POST requests containing XML with DOCTYPE declarations or external entity references
SIEM Query:
http.method:POST AND http.uri:"/x_program_center/jaxrs/mpweixin/check" AND (http.content_type:"application/xml" OR http.content_type:"text/xml")