CVE-2026-15282 tenteeglobal CVE debrief

Who should care

Users of the Instant Appointment plugin for WordPress, particularly those with administrative access, should be aware of this vulnerability and take immediate action to protect their sites. This includes updating the plugin to the latest version, restricting file uploads to only allow specific file types, and monitoring for suspicious file upload activity.

Technical summary

The Instant Appointment plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'insapp_upload_image_as_attachment' function in all versions up to, and including, 1.2. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. The vulnerability is critical with a CVSS score of 9.8.

Defensive priority

High

Recommended defensive actions

• Update the Instant Appointment plugin to the latest version
• Restrict file uploads to only allow specific file types
• Monitor for suspicious file upload activity
• Implement additional security measures such as Web Application Firewall (WAF) rules
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-10T05:16:30.820Z and was last modified on 2026-07-10T15:43:30.330Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD information. Defenders should verify affected deployments, review official advisories, and monitor for suspicious activity.

Official resources