CVE-2026-2141: WukongCRM Auth Bypass Vulnerability

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

bash

# 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