Quiz and Survey Master (QSM) <= 11.2.7 - Unauthenticated Arbitrary Shortcode Execution via 'qsm_unique_key' Parameter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-103917
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-07 07:17:01 UTC
Updated2026-11-08 19:17:31 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.002800000 probability, percentile 0.206280000 (date 2026-11-09)

Problem Types: CWE-94 | CWE-94 CWE-94 Improper Control of Generation of Code

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Expresstech Quiz And Survey Master QSM Quiz Maker Survey Maker affected 11.2.7 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/020209b3-2175-4509-836a-8a60e... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/renderer/frontend/class-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-qu... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-qu... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-qu... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Kuba (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-11-06T18:16:28.000ZDisclosed

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