# CVE-2026-9233: Quiz and Survey Master WordPress plugin authorization bypass

Source: https://junglewise.ai/threats/cve-2026-9233-quiz-and-survey-master-wordpress-plugin-authorization-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-27. Updated: 2026-06-27  
License: CC BY 4.0 with a link back

CVE-2026-9233 · Severity: medium · CVSS 4.3 · Published 2026-06-27

The Quiz and Survey Master plugin for WordPress, which is used to create and manage online quizzes and surveys, contains a security flaw in how it checks user permissions. This allows logged-in users with low-level access (such as contributors) to modify or delete quiz templates. An attacker could use this to disrupt survey operations or inject malicious scripts into quiz pages, potentially affecting site visitors.

Technologies: [ExpressTech Quiz and Survey Master](https://junglewise.ai/threats/technologies/quiz-and-survey-master). Vendors: [ExpressTech](https://junglewise.ai/threats/vendors/expresstech).

## Quick answers

**Is CVE-2026-9233 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9233 being exploited in the wild.

**How severe is CVE-2026-9233?** Medium severity, with a CVSS score of 4.3, published 27 June 2026.

**Which products and versions are affected?** ExpressTech Quiz and Survey Master up to, and including, 11.1.4.

**Is there a fix for CVE-2026-9233?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9233 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-9233?** Check whether you run ExpressTech Quiz and Survey Master at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Quiz and Survey Master (QSM) plugin for WordPress is vulnerable to a missing authorization check (CWE-862) in versions up to and including 11.1.4. The vulnerability exists because the plugin does not properly verify user permissions before allowing actions on the mlw_quiz_output_templates database table. Authenticated attackers with contributor-level permissions or higher can exploit this flaw via network requests to create, modify, or delete quiz output templates. Furthermore, the lack of sanitization allows for the storage of arbitrary HTML and script tags, potentially leading to stored cross-site scripting (XSS). A patch was released in version 11.1.5.

## Affected products

- expresstech Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker up to, and including, 11.1.4

## Timeline

- 2026-06-27: disclosed
- 2026-06-27: advisory

## References

- [https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/mlw_quizmaster2.php](https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/mlw_quizmaster2.php)
- [https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php](https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php)
- [https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php](https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php)
- [https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php](https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php)
- [https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/options-page-email-tab.php](https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/options-page-email-tab.php)
- [https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.1.2/mlw_quizmaster2.php](https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.1.2/mlw_quizmaster2.php)
- [https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.1.2/php/admin/functions.php](https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.1.2/php/admin/functions.php)

## Related threats

- [ExpressTech Quiz And Survey Master broken access control](https://junglewise.ai/threats/cve-2026-125787-missing-authorization-vulnerability-in-expresstech-quiz-and)
- [ExpressTech Quiz And Survey Master XSS in content injection](https://junglewise.ai/threats/cve-2026-125786-improper-neutralization-of-script-related-html-tags-in-a-web)
- [ExpressTech Quiz And Survey Master object injection](https://junglewise.ai/threats/cve-2026-111408-deserialization-of-untrusted-data-vulnerability-in-expresstech)
- [ExpressTech Quiz And Survey Master DOM-based XSS](https://junglewise.ai/threats/cve-2026-107862-improper-neutralization-of-input-during-web-page-generation)
- [ExpressTech Quiz And Survey Master object injection in deserialization](https://junglewise.ai/threats/cve-2026-104392-deserialization-of-untrusted-data-vulnerability-in-expresstech)