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PatchSiren cyber security CVE debrief

CVE-2026-15282 tenteeglobal CVE debrief

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 vulnerability allows unauthenticated attackers to upload arbitrary files on the affected site's server, potentially enabling remote code execution. Users should review their deployments, update to the latest version if available, and implement additional security measures.

Vendor
tenteeglobal
Product
Instant Appointment
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-10
Original CVE updated
2026-07-14
Advisory published
2026-07-10
Advisory updated
2026-07-14

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-15282 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-15282

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-15282 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-15282

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/instant-appointment/trunk/includes/ajax/ajax_services.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/instant-appointment/trunk/includes/front-end/ajax/login_ajax.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/instant-appointment/trunk/includes/front-end/ajax/login_ajax.php

    [email protected]

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.