CVE-2026-11780
Received Received - Intake

Stored XSS in Quiz and Survey Master WordPress Plugin

Publication date: 2026-08-16

Last updated on: 2026-08-16

Assigner: Wordfence

Description
The Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'question_title' parameter in all versions up to, and including, 11.2.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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Meta Information

Published
2026-08-16
Last Modified
2026-08-16
Generated
2026-08-16
AI Q&A
2026-08-16
EPSS Evaluated
N/A
NVD
CVE-2026-11780
EUVD
EUVD-2026-59860

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
qsm easy_quiz_and_survey_maker to 11.2.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

The Quiz and Survey Master (QSM) WordPress plugin has a stored Cross-Site Scripting (XSS) vulnerability in versions up to 11.2.1. It allows authenticated attackers with contributor-level access or higher to inject malicious scripts via the 'question_title' parameter. These scripts execute when users access the affected pages.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Quiz and Survey Master plugin versions up to 11.2.1. Check for suspicious scripts in question titles or survey pages. Use WordPress admin access logs to identify unauthorized edits by contributors or higher-level users.

Impact Analysis

An attacker could steal user sessions, redirect users to malicious sites, or perform actions on their behalf. Users with contributor access or higher can exploit this to compromise site visitors, leading to data theft or defacement.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR (data protection) and HIPAA (health data privacy). Organizations may face fines or legal consequences if user data is compromised due to this flaw.

Mitigation Strategies

Immediately update the Quiz and Survey Master plugin to the latest version beyond 11.2.1. Remove any unauthorized scripts from question titles or survey pages. Review user roles and restrict contributor-level access to trusted individuals.

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