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CVE-2026-11823 – Unauthenticated SQL Injection – BookingPress Appointment Booking Pro WordPress P…

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Summary

CVE-2026-11823 is a high-severity unauthenticated SQL Injection vulnerability in the BookingPress Appointment Booking Pro WordPress plugin by Repute Infosystems, affecting all versions up to and including 5.7.1. The flaw allows any unauthenticated remote attacker to extract sensitive data from the underlying WordPress database by submitting a crafted HTTP POST request — no credentials or user interaction are required. This vulnerability carries a CVSS v3.1 base score of 7.5 (HIGH).

Technical details

  • Root cause: The bpa_assign_staffmember_to_slots() function applies WordPress’s stripslashes_deep() to user-supplied POST data and then interpolates the store_service_date parameter verbatim into a SQL LIKE clause. The function does not use $wpdb->prepare() or any other form of parameterization or escaping, leaving the query open to direct manipulation.
  • Trigger conditions: No authentication, valid account, or special server configuration is required. Any party capable of sending an HTTP POST request to the affected endpoint can trigger the injection.
  • Attack vector: Network-accessible with low attack complexity (AC:L). The vulnerable endpoint is reachable directly over the internet from an unauthenticated context.
  • Impact: Exploitation enables an attacker to append additional SQL statements to existing database queries, allowing extraction of sensitive information from the WordPress database — including user credentials, customer personal data, and appointment records. Confidentiality impact is rated High (C:H); no integrity or availability impact is present.

Affected software

  • BookingPress Appointment Booking Pro (WordPress Plugin) by Repute Infosystems — all versions up to and including 5.7.1

Severity

  • CVSS v3.1 Base Score: 7.5 (HIGH)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Update the BookingPress Appointment Booking Pro plugin to the latest available version as soon as a security release is published. Monitor the official vendor changelog at https://www.bookingpressplugin.com/documents/changelog/ for a patched version that addresses this vulnerability.
  • If immediate patching is not feasible: Deploy a Web Application Firewall (WAF) rule to inspect and block malicious POST payloads targeting the affected booking endpoint. Where operationally viable, restricting unauthenticated access to booking form endpoints at the network perimeter can reduce exposure until a vendor patch is 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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