Quiz and Survey Master (QSM) <= 11.3.0 - Authenticated (Contributor+) Missing Authorization to Other Authors' Quiz Access and Modification via Abilities API
- ID
- WPSEC-2026-2894
- Plugin
- Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker (quiz-master-next)
- Affected
- from 11.1.0 before 11.3.1
- Remediation
- Update to 11.3.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Weakness
- CWE-639
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-11-12
- Attack surface
- Quiz and Survey Master (QSM) on WPSec AttackSurface
- Fix released
- Published
Description
The Quiz and Survey Master (QSM) plugin for WordPress is vulnerable to unauthorized access and modification of data via its Abilities API abilities (list-quizzes, get-quiz, list-questions, create-question) in all versions up to, and including, 11.3.0, due to the permission callbacks checking only the generic edit_qsm_quizzes capability rather than ownership of the specific quiz. This makes it possible for authenticated attackers, with Contributor-level access and above, to list and read quizzes and questions belonging to other authors and add questions to them, on sites where the WordPress Abilities API is available.
References
- https://wpsec.com/vuln/WPSEC-2026-2894/
- https://plugins.svn.wordpress.org/quiz-master-next/tags/11.3.1/
- https://wordpress.org/plugins/quiz-master-next/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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