CVE-2026-4807 — The Appointment Booking Calendar plugin for WordPress is

title: CVE-2026-4807 - Appointment Booking Calendar Appointment Deletion
id: scw-2026-05-07-ai-1
status: experimental
level: critical
description: |
  Detects attempts to delete appointments via the Appointment Booking Calendar plugin using the vulnerable delete endpoint. This rule specifically looks for POST requests to /wp-json/ssa/v1/appointments/{id}/delete that include both X-WP-Nonce and X-PUBLIC-Nonce headers, indicating a potential exploitation of CVE-2026-4807. The vulnerability allows unauthenticated attackers to delete arbitrary appointments by leveraging a flawed nonce validation.
author: SCW Feed Engine (AI-generated)
date: 2026-05-07
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-4807/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-method:
          - 'POST'
      uri|startswith:
          - '/wp-json/ssa/v1/appointments/'
      uri|endswith:
          - '/delete'
      cs-uri-query|contains:
          - 'X-WP-Nonce'
      cs-uri-query|contains:
          - 'X-PUBLIC-Nonce'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse