---
id: CVE-2026-15984
title: >-
  The QuickCal plugin for WordPress is vulnerable to Stored Cross-Site Scripting
  via Custom Field Parameters in all versions up to, and including, 1.0.20 due
  to insufficient input sanitization and output escaping
summary: >-
  The QuickCal plugin for WordPress is vulnerable to Stored Cross-Site Scripting
  via Custom Field Parameters in all versions up to, and including, 1.0.20 due
  to insufficient input sanitization and output escaping. This makes it possible
  fo…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: Themovation
product: QuickCal
affected:
  - QuickCal <= 1.0.20
published: '2026-09-05'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T17:17:32.797'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15984'
references:
  - url: >-
      https://codecanyon.net/item/quickcal-appointment-booking-calendar-for-wordpress/47981746
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/9bfcfc13-ccfb-4319-99a7-7d7510a11cfe?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-08T16:50:17.722473Z'
epss: 0.0019
epssPercentile: 0.07702
ingestedAt: '2026-09-06T02:48:41.218Z'
---

## Overview

The QuickCal plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Custom Field Parameters in all versions up to, and including, 1.0.20 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The nonce guarding the unauthenticated booked_add_appt AJAX action is publicly embedded on any page rendering the booking calendar shortcode, making it trivially obtainable by unauthenticated attackers without any prior account or privilege.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.