Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker <= 11.2.8 - Authenticated (Contributor+) PHP Object Injection via Quiz Contact Tab Settings
- ID
- WPSEC-2026-1583
- Plugin
- Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker (quiz-master-next)
- Affected
- all versions before 11.2.9
- Remediation
- Update to 11.2.9 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-502
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-24
- Attack surface
- Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker on WPSec AttackSurface
- Fix released
- Published
Description
The Quiz and Survey Master (QSM) plugin for WordPress is vulnerable to PHP Object Injection via the quiz Contact tab settings (the qsm_save_contact AJAX action) in all versions up to, and including, 11.2.8, due to the handler writing any submitted key into the quiz options, including 'select_category_question', which is later passed to maybe_unserialize() when the quiz is loaded on the front end. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject a serialized PHP object into a quiz they own. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
References
- https://wpsec.com/vuln/WPSEC-2026-1583/
- https://plugins.svn.wordpress.org/quiz-master-next/tags/11.2.9/
- https://wordpress.org/plugins/quiz-master-next/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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