CVE-2026-103917 json
Quiz and Survey Master (QSM) <= 11.2.7 - Unauthenticated Arbitrary Shortcode Execution via 'qsm_unique_key' Parameter
published 2d ago modified yesterday also EUVD-2026-118958
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
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.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- yesterday
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected products
- expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/020209b3-2175-4509-836a-8a60ed4f4b15?source=cve
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L536
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L2866
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L517
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.2.7/renderer/frontend/class-qsm-new-renderer.php#L244
- plugins.trac.wordpress.org /changeset?reponame=&old=3729156%40quiz-master-next&new=3729156%40quiz-master-next
Sources
- CVE List CVE-2026-103917
- NVD CVE-2026-103917
Fencer Intel 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.