Added vulnCheck XDB

README.md

@@ -670,6 +670,7 @@ performance of any of your sites from across the globe.<br>
 &nbsp;&nbsp; <a href="https://cve.mitre.org/"><b>CVE Mitre</b></a> - list of publicly known cybersecurity vulnerabilities.<br>
 &nbsp;&nbsp; <a href="https://www.cvedetails.com/"><b>CVE Details</b></a> - CVE security vulnerability advanced database.<br>
 &nbsp;&nbsp; <a href="https://www.exploit-db.com/"><b>Exploit DB</b></a> - CVE compliant archive of public exploits and corresponding vulnerable software.<br>
+&nbsp;&nbsp; <a href="https://vulncheck.com/xdb/"><b>VulnCheck XDB</b></a> - An index of exploit proof-of-concept code in Git repositories.<br>
 &nbsp;&nbsp; <a href="https://0day.today/"><b>0day.today</b></a> - exploits market provides you the possibility to buy/sell zero-day exploits.<br>
 &nbsp;&nbsp; <a href="https://sploitus.com/"><b>sploitus</b></a> - the exploit and tools database.<br>
 &nbsp;&nbsp; <a href="https://cxsecurity.com/exploit/"><b>cxsecurity</b></a> - free vulnerability database.<br>