What the vulnerability does
01Description
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 modify quizzes they do not own, overwrite quiz results pages, and reroute quiz-result notification emails to attacker-controlled addresses. An attacker first calls the /quiz/structure endpoint with an arbitrary victim quiz ID to obtain a valid nonce bound to that quiz ID and their own user ID, then presents that nonce to the /quizzes/{id}/emails save endpoint, which accepts it without verifying quiz ownership.
Explanation of Vulnerability in Simple Terms
02Summary
Quiz and Survey Master versions up to 11.1.4 lack proper authorization checks, allowing authenticated users to modify quiz or survey data they should not have access to. An attacker with a low-privilege account can alter quiz settings, questions, or responses. This affects the integrity of quiz results and survey data. Update to a version newer than 11.1.4.
What an attacker can do
03Attacker Capabilities
Modify quiz or survey data belonging to other users or administrators.
Potential impact on your site
04Site Impact
Quiz results and survey responses can be altered by unauthorized users, compromising data integrity.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege user account on the site.
Key dates
06Disclosure timeline
July 3, 2026
CVE published
