CVE-2026-25324 is an authorization bypass vulnerability identified in the ExpressTech Systems Quiz And Survey Master plugin, specifically affecting versions up to and including 10.3.4. The vulnerability stems from incorrectly configured access control security levels that rely on user-controlled keys to enforce authorization. An attacker can exploit this flaw by manipulating these keys, effectively bypassing the intended access restrictions. This allows unauthorized users to access or modify quiz and survey data, potentially leading to data leakage, unauthorized data manipulation, or privilege escalation within the affected application. The vulnerability does not require prior authentication or user interaction, increasing its risk profile. Although no public exploits have been reported yet, the nature of the flaw suggests it could be exploited with relative ease once details or exploit code become available. The plugin is commonly used in WordPress environments for creating and managing quizzes and surveys, often in educational, corporate training, or research contexts. The lack of a CVSS score indicates that the vulnerability is newly published and pending further assessment. The root cause is an access control misconfiguration where security levels are improperly enforced, relying on user-supplied keys that can be tampered with to bypass authorization checks. This vulnerability highlights the critical importance of robust access control mechanisms and validation of user inputs that influence authorization decisions.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on the Quiz And Survey Master plugin for critical functions such as employee training, educational assessments, or customer feedback collection. Unauthorized access could lead to exposure of sensitive personal data, intellectual property, or confidential survey results. Attackers might alter quiz content or results, undermining the integrity of assessments or data-driven decisions. This could damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR violations if personal data is exposed), and cause operational disruptions. The vulnerability's ease of exploitation without authentication increases the risk of widespread abuse. Organizations in sectors such as education, government, healthcare, and corporate training in Europe could face targeted attacks aiming to manipulate or steal sensitive information. Additionally, the breach of trust in survey or quiz data integrity could have downstream effects on decision-making processes and compliance reporting.

1. Monitor ExpressTech Systems and official plugin channels for security patches addressing CVE-2026-25324 and apply them immediately upon release. 2. Until patches are available, restrict access to the Quiz And Survey Master plugin administration interfaces to trusted users only, using network-level controls or WordPress role restrictions. 3. Review and harden access control configurations within the plugin, ensuring that authorization decisions do not rely on user-controllable keys or inputs. 4. Implement input validation and sanitization to prevent manipulation of keys or parameters used in authorization logic. 5. Conduct thorough audits of quiz and survey data for unauthorized changes or access, and monitor logs for suspicious activity related to the plugin. 6. Educate administrators and users about the risks of unauthorized access and encourage prompt reporting of anomalies. 7. Consider temporary disabling of the plugin if it is not critical to operations until a secure version is available. 8. Employ web application firewalls (WAF) with custom rules to detect and block attempts to exploit this vulnerability by monitoring unusual parameter manipulation.