CVE-2026-14516

Online Scheduling and Appointment Booking System <= 27.7 - Unauthenticated SQL Injection

2026-07-27 20:16
Nguyen Ngoc Duc (duc193)

Strategic Overview

Status
Patched in 27.8
Affected Plugin
Online Scheduling and Appointment Booking System – Bookly
Affected Version
<= 27.7
CVSS
7.5High
Weakness type
CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CVE
CVE-2026-14516
View all Online Scheduling and Appointment Booking System – Bookly vulnerabilities

At a glance

CVE-2026-14516 is a high-severity Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in the Online Scheduling and Appointment Booking System WordPress plugin, affecting versions <= 27.7. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires no authentication. The issue is fixed in version 27.8; sites on affected versions should update now. Disclosed July 2026, reported by Nguyen Ngoc Duc (duc193).

Vulnerability Overview

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to time-based SQL Injection via the 'staff_ids' parameter in all versions up to, and including, 27.7 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. Exploitation requires a two-request chain: an attacker first calls the unauthenticated bookly_get_form_id action to seed a booking session carrying malicious staff_ids values, then triggers bookly_render_time to cause the tainted array to reach the vulnerable query; CSRF/nonce validation is absent on both endpoints, meaning this chain can be initiated cross-site.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality.

CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Online Scheduling and Appointment Booking System <= 27.7 carries this weakness at staff_ids, and reaching it takes no account at all. SQL injection happens when request data is concatenated into a query instead of being bound as a parameter, letting an attacker change the structure of the statement rather than just its values.

A working injection can read any table the database user can see, which on a WordPress install means user records, password hashes and session or API secrets stored in options. For Online Scheduling and Appointment Booking System the fix is 27.8: builds <= 27.7 are affected, anything from 27.8 onward is not.

Remediation

Update to version 27.8, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Online Scheduling and Appointment Booking System 27.8 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-14516https://www.wordfence.com/threat-intel/vulnerabilities/id/5c55abc7-b09d-4fea-bc2f-b903d3da119fhttps://nvd.nist.gov/vuln/detail/CVE-2026-14516

Related records

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