# CVE-2026-103917: Quiz and Survey Master (QSM) <= 11.2.7 - Unauthenticated Arbitrary Shortcode Execution via 'qsm_unique_key' Parameter

Status: published. Published: 2026-11-07. Updated: 2026-11-07.

The The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 11.2.7. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes. The submission nonce is dispensed to any unauthenticated caller by the public wp_ajax_nopriv_qsm_create_quiz_nonce endpoint, meaning it functions as a CSRF token rather than an authorization barrier and imposes no meaningful obstacle to exploitation.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- expresstech / Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker: ≥ 0; ≤ 11.2.7 (affected, semver). Source: CNA: Wordfence

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N; source: CNA: Wordfence

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-94

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/020209b3-2175-4509-836a-8a60ed4f4b15?source=cve (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L536 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L2866 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L517 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/renderer/frontend/class-qsm-new-renderer.php#L244 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/changeset?reponame=&old=3729156%40quiz-master-next&new=3729156%40quiz-master-next (CNA: Wordfence)

## Provenance

- CNA: Wordfence: https://www.cve.org/CVERecord?id=CVE-2026-103917; retrieved 2026-11-07; source updated 2026-11-07

Revision: 18a404f01b2bdfdc859d5e886bced66d5ee81f2524a8f41880ce4122aeb1fb4e

Canonical: https://y2.dev/cve/CVE-2026-103917

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