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CVE-2026-84768 – Unauthenticated SQL Injection – VikAppointments Services Booking Calendar WordPress

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Summary

CVE-2026-84768 is an unauthenticated SQL Injection vulnerability affecting the VikAppointments Services Booking Calendar plugin for WordPress, in versions up to and including 1.2.20. The flaw allows a remote, unauthenticated attacker to inject and execute malicious SQL statements against the underlying database via a vulnerable plugin parameter. It carries a CVSS v3.1 base score of 9.3 (Critical), reflecting the combination of network exploitability, no authentication requirement, and significant confidentiality impact.

Technical details

  • Root cause: Improper neutralization of special elements used in an SQL command (CWE-89) within the VikAppointments plugin codebase, allowing untrusted input to be incorporated into SQL queries without adequate sanitization or parameterization.
  • Trigger conditions: No authentication or user interaction is required; the vulnerable functionality is reachable by any remote, unauthenticated user against a WordPress site running the affected plugin version.
  • Attack vector: Network (AV:N) — exploitable remotely over HTTP(S) against the WordPress site’s exposed plugin endpoints.
  • Exploitation technique: Classified as Blind SQL Injection (CAPEC-7), meaning the attacker infers database responses indirectly (e.g., via timing or boolean-based behavior) rather than through direct output of query results.
  • Impact: High confidentiality impact (unauthorized read access to database contents, potentially including sensitive booking, customer, or WordPress user/credential data) and low availability impact. No integrity impact was noted (I:N).

Affected software

  • VikAppointments – Services Booking Calendar WordPress plugin, versions ≤ 1.2.20
  • Fixed in version 1.2.21 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 VikAppointments Services Booking Calendar plugin to version 1.2.21 or later, where the SQL injection issue has been remediated.
  • If immediate patching is not possible:
    • Restrict or disable public access to the affected plugin’s booking/appointment endpoints until the update can be applied.
    • Deploy or update a Web Application Firewall (WAF) with SQL injection detection rules in front of the WordPress site.
    • Monitor web server and database logs for anomalous query patterns or unusual response timing consistent with blind SQL injection probing.
    • As a general hardening measure, ensure the WordPress core, all plugins, and themes are kept current, and limit database account privileges used by the application to the minimum required.

References

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