CVE-2026-9233

Quiz and Survey Master (QSM) <= 11.1.4 - Missing Authorization to Authenticated (Contributor+) Arbitrary Modification via qsm_insert_quiz_template AJAX Action

2026-06-26 17:57
Weerawat Pawanawiwat (ErbaZZ)

Strategic Overview

Status
Patched in 11.1.5
Affected Plugin
Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
Affected Version
<= 11.1.4
CVSS
4.3Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-9233
View all Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker vulnerabilities

At a glance

CVE-2026-9233 is a medium-severity Missing Authorization vulnerability in the Quiz and Survey Master (QSM) WordPress plugin, affecting versions <= 11.1.4. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 11.1.5; sites on affected versions should update now. Disclosed June 2026, reported by Weerawat Pawanawiwat (ErbaZZ).

Vulnerability Overview

The Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 11.1.4. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with contributor-level access and above, to create, modify, and delete quiz output templates stored in the mlw_quiz_output_templates database table, including storing unsanitized HTML content such as arbitrary script tags.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in Quiz and Survey Master (QSM) <= 11.1.4 takes an account at Contributor level or above. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Quiz and Survey Master (QSM) the fix is 11.1.5: builds <= 11.1.4 are affected, anything from 11.1.5 onward is not.

Remediation

Update to version 11.1.5, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Quiz and Survey Master (QSM) 11.1.5 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-9233https://www.wordfence.com/threat-intel/vulnerabilities/id/38db911b-cad5-4c8c-b0a4-70dc543b4591https://nvd.nist.gov/vuln/detail/CVE-2026-9233

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C