---
id: CVE-2026-96558
title: >-
  The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for
  WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the
  'qsm_hidden_questions' parameter in all versions up to, and including, 11.2.6
  due to insuffi…
summary: >-
  The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for
  WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the
  'qsm_hidden_questions' parameter in all versions up to, and including, 11.2.6
  due to insuffi…
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
published: '2026-10-10'
updated: '2026-10-10'
sourceUpdated: '2026-10-10T07:16:42.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96558'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/js/qsm-admin.js#L758
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/admin/tools-page.php#L548
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L2850
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L3002
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qsm-audit.php#L36
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3711419%40quiz-master-next&new=3711419%40quiz-master-next
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/0e344974-08c8-45a5-a0f4-3780ce00928b?source=cve
    label: security@wordfence.com
tags:
  - nvd
ingestedAt: '2026-10-10T07:26:21.926Z'
---

## Overview

The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'qsm_hidden_questions' parameter in all versions up to, and including, 11.2.6 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. This requires the attacker to force the mlw_results INSERT to fail by submitting an over-length or duplicate qsm_unique_key value, which triggers the audit trail code branch that writes the unescaped payload to wp_mlw_qm_audit_trail.form_data.

## Remediation

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