CVE-2026-39495 NSquared CVE debrief

Who should care

Users of the Simply Schedule Appointments plugin, particularly those with untrusted users accessing the appointment scheduling functionality, should be aware of this vulnerability and take steps to mitigate it. This includes updating the plugin to a version that addresses this vulnerability and implementing web application firewalls (WAFs) to detect and prevent SQL injection attacks.

Technical summary

The Simply Schedule Appointments plugin for WordPress is vulnerable to Blind SQL Injection attacks due to improper neutralization of special elements used in SQL commands. This vulnerability affects versions up to 1.6.9.27 and has a CVSS score of 8.5 with a HIGH severity rating. The issue allows attackers to perform unauthorized actions, potentially leading to data manipulation and unauthorized access. Users of the plugin should be aware of this vulnerability and take steps to mitigate it, particularly those with untrusted users accessing the appointment scheduling functionality. To address this vulnerability, users should update the plugin to a version that addresses this issue and implement web application firewalls (WAFs) to detect and prevent SQL injection attacks. Additionally, defenders should monitor database activity for suspicious queries and limit database privileges for the user account used by the plugin.

Defensive priority

High priority should be given to updating the Simply Schedule Appointments plugin to a version that addresses this vulnerability. Additionally, defenders should implement compensating controls, monitor database activity for suspicious queries, and limit database privileges for the user account used by the plugin.

Recommended defensive actions

• Update the Simply Schedule Appointments plugin to the latest version.
• Implement web application firewalls (WAFs) to detect and prevent SQL injection attacks.
• Monitor database activity for suspicious queries.
• Limit database privileges for the user account used by the plugin.
• Regularly review and update the plugin to ensure you have the latest security patches.

Evidence notes

The CVE record was published on 2026-04-08T09:16:23.800Z and last modified on 2026-07-24T21:10:00.143Z. The NVD entry is currently Deferred. This information is based on the supplied source corpus and may not reflect the current status of the vulnerability. Defenders should verify the affected scope and severity with the vendor or through other trusted sources.

Official resources