Medium severity · published Jun 27, 2026
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
4.3
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QA
Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker · expresstech
through 11.1.4 · source: vendor
Affected product
QA
Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker
expresstech
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9233
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9233
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/mlw_quizmaster2.php#L931
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php#L1557
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php#L1563
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/functions.php#L1638
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.0.0/php/admin/options-page-email-tab.php#L52
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.1.2/mlw_quizmaster2.php#L931
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