CVE-2026-110381 NSquared CVE debrief

Who should care

WordPress administrators, security teams, and users of the Simply Schedule Appointments plugin should assess their exposure and take necessary actions to mitigate the vulnerability.

Why it matters

The CVE-2026-110381 vulnerability in the WordPress Simply Schedule Appointments plugin requires attention from administrators and security teams to prevent potential unauthorized access and data breaches.

• Potential unauthorized access to sensitive data
• Possible bypass of authorization mechanisms
• Need for verification of plugin configuration and user permissions
• Requirement for updating plugin versions to 1.6.12.37 or later

Technical summary

The Simply Schedule Appointments plugin for WordPress, versions up to and including 1.6.12.35, is vulnerable to an Insecure Direct Object References (IDOR) issue. This vulnerability could allow an attacker to bypass authorization and access sensitive data. The issue arises from the plugin's improper handling of direct object references, which can be exploited to gain unauthorized access. Users should update to version 1.6.12.37 or later to mitigate this vulnerability. Implementing additional security measures, such as enhanced access controls and monitoring, can further reduce the risk of exploitation.

Defensive priority

Medium

Recommended defensive actions

• Review and update Simply Schedule Appointments plugin versions to 1.6.12.37 or later
• Implement additional access controls and monitoring for sensitive data
• Verify plugin configuration and user permissions
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details about the vulnerability, including its CVSS score of 6.3 and severity of MEDIUM. The affected product is Simply Schedule Appointments, versions from n/a through 1.6.12.35.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.