The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'qsm_hidden_questions' parameter in all versions up to, and including, 11.2.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to force the mlw_results INSERT to fail by submitting an over-length or duplicate qsm_unique_key value, which triggers the audit trail code branch that writes the unescaped payload to wp_mlw_qm_audit_trail.form_data.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
expresstech:quiz and survey master (qsm) – quiz maker & survey maker
References 7
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/js/qsm-…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/adm…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/cla…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/cla…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.6/php/cla…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&old=3711419%40quiz-maste…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/0e344974-08c8-45a5-a0…
security@wordfence.com