Quiz and Survey Master (QSM) <= 11.1.4 - Missing Authorization to Authenticated (Contributor+) Arbitrary Quiz Modification and Email Reroute via Leaked Nonce from /quiz/structure
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker | <= 11.1.4 | 11.1.5 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-862- Platform
- WordPress
- Package
Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker- Disclosed
- 02.07.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 49c66f9e-e58c-435b-9bb0-d6b66261e789 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 80
- First → latest
- 07.2015 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 4
- High 16
- Medium 60
Disclosures per year
- 2017: 0
- 2018: 0
- 2019: 2
- 2020: 4
- 2021: 6
- 2022: 16
- 2023: 10
- 2024: 7
- 2025: 5
- 2026: 28
earlier: 2
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Quiz and Survey Master (QSM) <= 11.1.4 - Missing Authorization to Authenticated (Contributor+) Arbitrary Quiz Modification and Email Reroute via Leaked Nonce from /quiz/structure this entry
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