Executive Summary

CVE-2026-39495 is a SQL Injection vulnerability found in the WordPress Simply Schedule Appointments Plugin versions up to and including 1.6.9.27.

This vulnerability allows a malicious actor to interact directly with the plugin's database by injecting malicious SQL commands, potentially leading to unauthorized access or manipulation of data.

It falls under the OWASP Top 10 category A3: Injection, specifically SQL Injection, and requires at least contributor or developer privileges to exploit.

The issue was reported in early 2026 and has been patched in version 1.6.9.29 of the plugin.

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Impact Analysis

This vulnerability can allow attackers to perform unauthorized database operations such as data theft or data manipulation within the Simply Schedule Appointments plugin.

Such unauthorized access can compromise the integrity and confidentiality of your data.

Although the vulnerability has a high CVSS score of 8.5 indicating severe risk, its impact in typical WordPress environments is considered low by Patchstack.

To mitigate the risk, users should update the plugin to version 1.6.9.29 or later.

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Mitigation Strategies

The recommended immediate step to mitigate the CVE-2026-39495 vulnerability is to update the Simply Schedule Appointments WordPress plugin to version 1.6.9.29 or later.

This update patches the SQL Injection flaw present in versions up to and including 1.6.9.27, preventing unauthorized database access.

Additionally, using automated update tools like Patchstack can facilitate rapid protection by automatically updating vulnerable plugins.

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Detection Guidance

The CVE-2026-39495 vulnerability is a Blind SQL Injection flaw in the Simply Schedule Appointments WordPress plugin versions up to 1.6.9.27. Detection typically involves testing the plugin's input fields or parameters that interact with the database for SQL injection vulnerabilities.

Since this is a Blind SQL Injection, detection can be performed by sending crafted payloads that cause time delays or boolean-based responses to infer the presence of the vulnerability.

• Use tools like sqlmap to test the plugin endpoints or parameters for SQL injection, for example: sqlmap -u "http://targetsite.com/?param=value" --risk=3 --level=5 --dbs
• Manually test input fields by injecting payloads such as ' OR SLEEP(5)-- to observe if the response time increases, indicating a Blind SQL Injection.
• Check the plugin version installed on your WordPress site using WP-CLI: wp plugin list | grep simply-schedule-appointments to verify if it is version 1.6.9.27 or earlier, which are vulnerable.

The best mitigation is to update the plugin to version 1.6.9.29 or later, which patches this vulnerability.

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Compliance Impact

The CVE-2026-39495 vulnerability is a SQL Injection flaw that allows unauthorized database access, which could potentially lead to data theft or manipulation.

Such unauthorized access to sensitive data may impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and health information against unauthorized access and breaches.

However, the provided information does not explicitly discuss the direct effects of this vulnerability on compliance with these standards.

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