Quiz and Survey Master (QSM) <= 11.2.6 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter
The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'qsm_hidden_questions' parameter in all versions up to, and including, 11.2.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to force the mlw_results INSERT to fail by submitting an over-length or duplicate qsm_unique_key value, which triggers the audit trail code branch that writes the unescaped payload to wp_mlw_qm_audit_trail.form_data.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker | <= 11.2.6 | 11.2.7 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- WordPress
- Package
Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker- Disclosed
- 09.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 0e344974-08c8-45a5-a0f4-3780ce00928b - 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) <= 11.2.6 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter this entry
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