CVE-2025-10302 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Ultimate Viral Quiz plugin for WordPress, developed by hameha. This vulnerability exists in all versions up to and including 1.0 due to missing or incorrect nonce validation in the save_options() function. Nonces in WordPress are security tokens used to verify that requests are intentional and originate from legitimate users. The absence or improper implementation of nonce validation allows unauthenticated attackers to craft malicious requests that, when executed by an authenticated site administrator (e.g., by clicking a link), can update the plugin's settings without authorization. This attack vector requires user interaction but no prior authentication, making it a significant risk especially on sites with administrative users who might be tricked into clicking malicious links. The vulnerability impacts the integrity of the plugin’s configuration but does not directly affect confidentiality or availability. The CVSS v3.1 base score is 4.3 (medium severity), reflecting the low complexity of attack (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). No known exploits are currently in the wild, and no patches have been published at the time of this report. The vulnerability is categorized under CWE-352, which is a common web security weakness related to CSRF attacks. Given that WordPress is widely used across Europe and the plugin targets viral quizzes, this vulnerability could be leveraged to manipulate quiz settings, potentially impacting user experience or enabling further chained attacks if the plugin settings influence other site behaviors.

For European organizations, especially those using WordPress with the Ultimate Viral Quiz plugin, this vulnerability poses a risk to the integrity of website configurations. Attackers could alter plugin settings to disrupt quiz functionality, potentially damaging user engagement or trust. While the vulnerability does not directly expose sensitive data or cause denial of service, unauthorized changes could be leveraged as part of a broader attack chain, for example, by injecting malicious content or redirecting users. Organizations relying on quizzes for marketing, user interaction, or data collection could face reputational harm or operational disruption. Since the attack requires tricking an administrator into clicking a link, organizations with less stringent user awareness or lacking multi-factor authentication on admin accounts are more vulnerable. The medium severity rating indicates a moderate risk, but the widespread use of WordPress in Europe means the potential attack surface is large. Additionally, sectors with high reliance on web presence, such as e-commerce, media, and education, could be disproportionately affected if their sites use this plugin.

To mitigate this vulnerability, European organizations should first verify if the Ultimate Viral Quiz plugin is installed and identify the version in use. Immediate steps include: 1) Restrict administrative access to trusted personnel and enforce strong authentication mechanisms, including multi-factor authentication, to reduce the risk of credential compromise and inadvertent clicks. 2) Educate administrators about phishing and social engineering tactics to prevent them from clicking malicious links that could trigger CSRF attacks. 3) Implement web application firewalls (WAFs) with rules designed to detect and block suspicious POST requests targeting the plugin’s save_options() endpoint. 4) Monitor plugin updates closely and apply patches as soon as they become available from the vendor. 5) If no patch is available, consider temporarily disabling the plugin or replacing it with alternatives that have proper nonce validation. 6) Conduct regular security audits and penetration testing focused on CSRF and other web vulnerabilities. 7) Employ Content Security Policy (CSP) headers to restrict the sources of executable scripts and reduce the risk of cross-site attacks. These measures, combined, reduce the likelihood of successful exploitation and limit potential damage.