CVE-2026-22688
📋 TL;DR
CVE-2026-22688 is a command injection vulnerability in WeKnora that allows authenticated users to inject malicious commands into MCP stdio settings, causing the server to execute arbitrary subprocesses. This affects all WeKnora deployments prior to version 0.2.5. Attackers with authenticated access can achieve remote code execution on the server.
💻 Affected Systems
- Tencent WeKnora
📦 What is this software?
Weknora by Tencent
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise leading to data theft, lateral movement, and persistent backdoor installation
Likely Case
Authenticated attackers executing arbitrary commands with server privileges, potentially leading to data exfiltration
If Mitigated
Limited impact if proper network segmentation and least privilege access controls are implemented
🎯 Exploit Status
Exploitation requires authenticated access to WeKnora's MCP stdio configuration
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.2.5
Vendor Advisory: https://github.com/Tencent/WeKnora/security/advisories/GHSA-78h3-63c4-5fqc
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Stop WeKnora service. 3. Update to version 0.2.5 using package manager or manual installation. 4. Restart WeKnora service. 5. Verify functionality.
🔧 Temporary Workarounds
Restrict MCP stdio configuration access
allLimit access to MCP stdio configuration settings to trusted administrators only
Network segmentation
allIsolate WeKnora servers from sensitive systems and limit outbound connections
🧯 If You Can't Patch
- Implement strict access controls to limit authenticated users who can modify MCP settings
- Deploy application-level firewall rules to monitor and block suspicious command execution patterns
🔍 How to Verify
Check if Vulnerable:
Check WeKnora version using the application's admin interface or by examining package versionCheck Version:
Check WeKnora configuration files or use package manager: dpkg -l | grep weknora or rpm -qa | grep weknoraVerify Fix Applied:
Confirm version is 0.2.5 or later and test that command injection attempts are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual subprocess executions from WeKnora
- Suspicious command strings in MCP configuration logs
- Multiple failed authentication attempts followed by configuration changes
Network Indicators:
- Unexpected outbound connections from WeKnora server
- Command and control traffic patterns
SIEM Query:
source="weknora" AND (event="subprocess_execution" OR event="config_change") AND command="*;*" OR command="*|*" OR command="*`*"