CVE-2026-96558
Quiz and Survey Master (QSM) <= 11.2.6 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'qsm_hidden_questions' Parameter
- Published
- Updated
- Reserved
- Assigned by
- Wordfence
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| NVDNVD · Deferred | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.24% · top 85% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Weakness
Affected products
expresstech · Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
- affected ≤ 11.2.6
References (7)
- https://www.wordfence.com/threat-intel/vulnerabilities/id/0e344974-08c8-45a5-a0f4-3780ce00928b?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/js/qsm-admin.js#L758 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L3002 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qsm-audit.php#L36 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/admin/tools-page.php#L548 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/classes/class-qmn-quiz-manager.php#L2850 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3711419%40quiz-master-next&new=3711419%40quiz-master-next (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-96558)Record last updated .