CVE-2026-96558Quiz and Survey Master (QSM) <= 11.2.6 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter
Updated under an hour ago ()
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It affects expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.24%, higher than 14% of scored CVEs.
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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.
- CVSS
- 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.24% (percentile 14)
- Assigned by
- Wordfence
- NVD analysis
- Deferred
- Record last updated
- Oct 11, 2026
- First seen by InfoSec Signals
- Oct 10, 2026
Affected products
expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker expresstech:quiz_and_survey_master_qsm_quiz_maker_and_survey_maker (from the name) | through 11.2.6 | CNA record |
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/0e344974-08c8-45a5-a0f4-3780ce00928b?source=cve
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/js/qsm-admin.js#L758
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L3002
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qsm-audit.php#L36
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/admin/tools-page.php#L548
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L2850
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3711419%40quiz-master-next&new=3711419%40quiz-master-next
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.