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CVE-2026-9830 – Authentication Bypass – BookingPress Appointment Booking Pro WordPress Plugin bef…

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Summary

CVE-2026-9830 is a high-severity authentication bypass vulnerability in the BookingPress Appointment Booking Pro WordPress plugin, affecting all versions prior to 5.7.3. The plugin fails to correctly invoke its REST API permission callback, leaving every route in one of its API namespaces accessible without authentication. With a CVSS v3.1 score of 8.2 (High), unauthenticated remote attackers can read sensitive customer booking data and modify other users’ reservations without any credentials or user interaction.

Technical details

  • Root cause: The plugin does not properly implement REST permission callbacks (CWE-287: Improper Authentication), leaving an entire API namespace unprotected — every registered route within that namespace is reachable without credentials.
  • Trigger conditions: No authentication, privileges, or user interaction required; any unauthenticated HTTP request to the affected namespace endpoints is sufficient to trigger the flaw.
  • Attack vector: Network-accessible via the WordPress REST API (/wp-json/bookingpress-app/v1/). Confirmed vulnerable endpoints include the calendar endpoint (returns full booking ledgers with customer PII), the appointment reschedule endpoint (allows tampering with other users’ bookings and triggers legitimate notification emails to victims), and the time-availability endpoint (exposes full scheduling data).
  • Impact:
    • Confidentiality (High): Unauthenticated retrieval of customer booking records, including names, email addresses, phone numbers, services booked, and pricing information.
    • Integrity (Low): Unauthenticated modification of existing bookings, including rescheduling appointments belonging to other users.

Affected software

  • BookingPress Appointment Booking Pro (WordPress Plugin) — all versions before 5.7.3

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate: Update the BookingPress Appointment Booking Pro plugin to version 5.7.3 or later, which correctly enforces REST API permission callbacks on all routes.
  • If immediate patching is not possible: Apply WAF rules to block unauthenticated POST requests to /wp-json/bookingpress-app/v1/ endpoints, or temporarily disable the plugin, until the patch can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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