CVE-2026-96558 json
Quiz and Survey Master (QSM) <= 11.2.6 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter
published 2026-10-10 30 d ago modified 2026-10-13 26 d ago also EUVD-2026-96227
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 28 d ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
- expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/0e344974-08c8-45a5-a0f4-3780ce00928b?source=cve
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.6/js/qsm-admin.js#L758
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L3002
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.6/php/classes/class-qsm-audit.php#L36
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.6/php/admin/tools-page.php#L548
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L2850
- plugins.trac.wordpress.org /changeset?reponame=&old=3711419%40quiz-master-next&new=3711419%40quiz-master-next
Sources
- CVE List CVE-2026-96558
- NVD CVE-2026-96558
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.