Appointment Booking Calendar Vulnerability— Simply Schedule Appointments Booking Plugin – Authenticated (Subscriber+) SQL Injection – CVE-2024-2341 |WordPress Plugin Vulnerability Report

Plugin Name: Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

Key Information:

  • Software Type: Plugin
  • Software Slug: simply-schedule-appointments
  • Software Status: Active
  • Software Author: croixhaug
  • Software Downloads: 963,505
  • Active Installs: 30,000
  • Last Updated: March 20, 2024
  • Patched Versions:
  • Affected Versions: <=

Vulnerability Details:

  • Name: Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <=
  • Title: Authenticated (Subscriber+) SQL Injection
  • Type: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • CVE: CVE-2024-2341
  • CVSS Score: 8.8
  • Publicly Published: March 20, 2024
  • Researcher: Krzysztof Zając - CERT PL
  • Description: The plugin is vulnerable to SQL Injection via the 'keys' parameter due to insufficient escaping and lack of preparation on the existing SQL query. This allows authenticated attackers, with subscriber access and above, to inject additional SQL queries that can extract sensitive information from the database.


The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin for WordPress has a critical vulnerability in versions up to and including, enabling authenticated SQL injection attacks. This vulnerability, patched in version, allowed attackers with subscriber-level access or higher to manipulate database queries, posing a severe security risk.

Detailed Overview:

This vulnerability was identified by Krzysztof Zając from CERT PL and is a high-severity issue with a CVSS score of 8.8, indicating its critical nature. Authenticated users, starting from subscriber level, could exploit the 'keys' parameter to execute unauthorized SQL commands. Such attacks could lead to unauthorized access to sensitive data, data manipulation, or even database takeover, significantly compromising website security and integrity. The prompt release of patch by the developers has addressed this critical issue, highlighting the need for immediate updates.

Advice for Users:

  • Immediate Action: It's imperative for users of the Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin to update to the patched version without delay.
  • Check for Signs of Vulnerability: Administrators should review their database and access logs for any unusual activities or unauthorized data access attempts that might indicate past exploitation of this vulnerability.
  • Alternate Plugins: While the vulnerability has been patched, users may still consider exploring alternative appointment booking plugins to ensure diversification and mitigate the risk of future vulnerabilities.
  • Stay Updated: Always keep your WordPress plugins updated to the latest versions. Regular updates are crucial for maintaining the security and functionality of your website.


The discovery and subsequent patching of the SQL Injection vulnerability in the Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin underscore the continuous threat landscape in the digital realm and the importance of maintaining updated software. By updating to version or later, users can protect their WordPress installations from this specific threat, reinforcing the critical nature of proactive security practices.


Detailed Report: 

In today's digital ecosystem, the security of your WordPress website is paramount. A recent security vulnerability discovered in the "Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin," marked as CVE-2024-2341, has highlighted the ever-present cyber threats facing online platforms. This critical flaw, which allowed authenticated SQL injection attacks, posed a significant risk to websites by enabling attackers with minimal subscriber-level access to execute malicious database queries. With the plugin being actively used in over 30,000 installations, the potential for widespread impact was alarmingly high.

About the Plugin:

The "Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin," developed by croixhaug, is a popular solution among WordPress users for scheduling appointments. Its broad functionality and ease of use have contributed to its substantial download figure of 963,505. However, like any software, it's susceptible to vulnerabilities that can compromise user data and website integrity.

Vulnerability Insights:

CVE-2024-2341 specifically targeted versions up to and including of the plugin, allowing attackers to manipulate SQL queries through the 'keys' parameter. This breach could lead to unauthorized access to sensitive data, database manipulation, or even total database control, underlining the severity of the threat. The vulnerability was publicly disclosed on March 20, 2024, by researcher Krzysztof Zając from CERT PL, emphasizing the urgent need for remediation.

Risks and Impacts:

The vulnerability posed a significant risk to the confidentiality, integrity, and availability of data. For small business owners, such a breach could result in data loss, financial damages, and a tarnished reputation. In an era where data is king, safeguarding your website's security is not just about protecting data; it's about preserving trust and credibility.

Remediation Steps:

Promptly addressing this issue, the developers released a patched version,, effectively neutralizing the threat. Users are strongly encouraged to update their plugin to this latest version to secure their sites. Regularly monitoring for updates and understanding the importance of immediate action when vulnerabilities are announced is crucial for maintaining a secure online environment.

Historical Context:

This wasn't the plugin's first encounter with security vulnerabilities; it has seen 7 previous vulnerabilities since August 8, 2022. This pattern underscores the necessity for continuous vigilance and the adoption of proactive security measures.


Staying ahead of security vulnerabilities is a critical yet challenging task, especially for small business owners who might lack the time or resources for constant website maintenance. However, the digital landscape's dynamic nature demands a proactive approach to security. Leveraging automated update features, employing reputable security plugins, and staying informed about potential threats are vital steps in fortifying your website against the ever-evolving array of cyber threats. Remember, in the realm of cybersecurity, complacency is the enemy, and vigilance is your strongest ally.

Staying Secure

Staying on top of WordPress security can feel overwhelming for small business owners without dedicated IT staff. At Your WP Guy, we exist to shoulder that burden for you. Our WordPress experts can fully audit, secure, maintain and support your site - so you can focus on growing your business with peace of mind.

Don't tackle security risks alone. Let us help you assess any impact from this vulnerability, update your plugins, and implement ongoing maintenance to avoid future threats. We treat your website like it's our own - because we know how critical it is for reaching your customers.

Get in touch for a free consultation today on making WordPress security stress-free. Call 678-995-5169 or book a call here. Our knowledgeable team is ready to help you safeguard your online presence.

Appointment Booking Calendar Vulnerability— Simply Schedule Appointments Booking Plugin – Authenticated (Subscriber+) SQL Injection – CVE-2024-2341 |WordPress Plugin Vulnerability Report FAQs

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