CVE-2026-2141 Overview
A security flaw has been discovered in WuKongOpenSource WukongCRM up to version 11.3.3. This vulnerability affects the URL Handler component within the file gateway/src/main/java/com/kakarote/gateway/service/impl/PermissionServiceImpl.java. The flaw involves improper authorization (CWE-266: Incorrect Privilege Assignment), allowing attackers to manipulate URL requests and bypass permission controls. Remote exploitation of this vulnerability is possible, and an exploit has been publicly disclosed.
Critical Impact
Attackers can remotely exploit this improper authorization vulnerability to bypass access controls in WukongCRM, potentially gaining unauthorized access to restricted functionality and sensitive data.
Affected Products
- WuKongOpenSource WukongCRM versions up to 11.3.3
- WukongCRM Gateway Service component
- Systems running the affected PermissionServiceImpl.java URL Handler
Discovery Timeline
- February 8, 2026 - CVE-2026-2141 published to NVD
- February 9, 2026 - Last updated in NVD database
Technical Details for CVE-2026-2141
Vulnerability Analysis
This vulnerability stems from improper authorization handling in WukongCRM's gateway service. The PermissionServiceImpl.java file, responsible for URL-based permission validation, fails to properly enforce authorization checks under certain conditions. This allows authenticated users with low privileges to access resources and functionality beyond their intended authorization scope.
The flaw is classified under CWE-266 (Incorrect Privilege Assignment), indicating that the application incorrectly assigns or validates privileges during request processing. When URL manipulation is performed, the permission service fails to adequately verify that the requesting user has appropriate authorization for the targeted resource.
Root Cause
The root cause lies in the URL Handler implementation within the PermissionServiceImpl.java file in the gateway component. The permission validation logic does not properly sanitize or validate URL parameters before making authorization decisions. This results in incorrect privilege assignment when processing specially crafted requests, allowing users to escalate their access permissions or bypass authorization controls entirely.
Attack Vector
The attack is network-accessible, meaning attackers can exploit this vulnerability remotely without requiring physical access to the target system. The exploitation requires low-privilege user authentication to the WukongCRM system. An attacker would need to:
- Authenticate to the WukongCRM application with a valid low-privilege account
- Craft malicious URL requests targeting the vulnerable permission service
- Manipulate URL parameters to bypass authorization checks
- Access resources or functionality intended for higher-privileged users
The vulnerability has been publicly disclosed with exploit details available. Technical details and discussion can be found in the GitHub Issue Discussion. The vendor was contacted about this disclosure but did not respond.
Detection Methods for CVE-2026-2141
Indicators of Compromise
- Unusual URL patterns in gateway access logs targeting /gateway/ endpoints with manipulated parameters
- Authenticated users accessing resources outside their normal permission scope
- Anomalous request patterns to the PermissionServiceImpl endpoint
- Access log entries showing low-privilege users reaching administrative or restricted functionality
Detection Strategies
- Implement logging and monitoring on the WukongCRM gateway service for abnormal URL request patterns
- Review access logs for users accessing resources inconsistent with their assigned roles
- Deploy web application firewall (WAF) rules to detect URL manipulation attempts targeting the permission service
- Monitor authentication logs for accounts exhibiting privilege escalation behavior
Monitoring Recommendations
- Enable detailed request logging in the WukongCRM gateway component
- Configure alerting for access attempts to sensitive endpoints from unauthorized user roles
- Implement real-time monitoring of the PermissionServiceImpl.java component behavior
- Regularly audit user access patterns against their assigned permission levels
How to Mitigate CVE-2026-2141
Immediate Actions Required
- Restrict network access to the WukongCRM gateway service to trusted networks only
- Review and audit all user accounts and their assigned permission levels
- Implement additional authentication controls or multi-factor authentication for sensitive operations
- Consider temporarily disabling public access to the affected CRM system until patches are available
Patch Information
As of the last update on February 9, 2026, no official patch has been released by WuKongOpenSource. The vendor was contacted about this disclosure but did not respond. Organizations should monitor the VulDB entry and the WuKongOpenSource repository for any future security updates or patches.
Workarounds
- Implement network segmentation to isolate the WukongCRM gateway service from untrusted networks
- Deploy a reverse proxy or WAF with strict URL validation rules in front of the WukongCRM application
- Apply the principle of least privilege by restricting user accounts to minimum necessary permissions
- Conduct code review and implement custom patches to add additional authorization validation in the URL Handler
# Configuration example - Restrict access to WukongCRM gateway using firewall rules
# Allow only trusted internal networks to access the gateway service
iptables -A INPUT -p tcp --dport 8080 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
