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CVE-2026-103352 – Unauthenticated Blind SQL Injection – WP BASE Booking WordPress Plugin (≤ 6.4.0)

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Summary

CVE-2026-103352 is a critical, unauthenticated blind SQL injection vulnerability in the WP BASE Booking plugin for WordPress (wp-base-booking-of-appointments-services-and-events), affecting all versions up to and including 6.4.0. The flaw stems from improper neutralization of special elements used in SQL commands (CWE-89), allowing a remote attacker to inject SQL statements without any authentication or user interaction. It carries a CVSS v3.1 base score of 9.3 (Critical) and was fixed in version 6.5.0.

Technical details

  • Root cause: The plugin fails to properly sanitize/parameterize user-supplied input before using it in SQL queries, classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command).
  • Trigger conditions: An attacker sends crafted input to a vulnerable plugin endpoint; no authentication, special privileges, or user interaction are required to trigger the injection.
  • Attack vector: Network-accessible (AV:N), low attack complexity (AC:L), exploitable remotely over HTTP(S) against any internet-facing WordPress site running the vulnerable plugin.
  • Exploitation technique: The vulnerability is exploited as a blind SQL injection (CAPEC-7), meaning results are inferred indirectly (e.g., via timing or boolean responses) rather than returned directly in application output, but still allows systematic extraction of database contents.
  • Impact: The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L) indicates a changed scope, high confidentiality impact, and low availability impact — an attacker can read sensitive data from the underlying database (e.g., user accounts and private booking data) and potentially degrade availability, without needing to modify data integrity directly through this flaw.

Affected software

  • Plugin: WP BASE Booking (WP BASE Booking of Appointments, Services and Events) for WordPress
  • Vendor: WP BASE
  • Affected versions: All versions from the earliest release through 6.4.0 (inclusive)
  • Fixed version: 6.5.0 and later

Severity

  • CVSS v3.1 Base Score: 9.3 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Mitigation and recommended actions

  • Immediate: Update the WP BASE Booking plugin to version 6.5.0 or later, which remediates the SQL injection flaw.
  • If immediate patching is not possible: Restrict or disable public access to the plugin’s booking-related endpoints/forms until the update can be applied, and monitor web server and database logs for anomalous or malformed query patterns indicative of SQL injection attempts.
  • General hardening: Ensure WordPress core, all plugins, and themes are kept up to date, and apply the principle of least privilege to the database account used by WordPress to limit the impact of any successful injection.

References

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