CVE-2025-11992 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the Multi Item Responsive Slider plugin for WordPress, maintained by cnaveenkumar. The vulnerability arises from missing or incorrect nonce validation on the 'mioptions.php' administrative page, which handles plugin settings. Nonces in WordPress are security tokens designed to verify that requests to perform sensitive actions originate from legitimate users and not from forged requests. Without proper nonce validation, an attacker can craft a malicious link or webpage that, when visited or clicked by a logged-in administrator, causes the administrator's browser to send unauthorized requests to the vulnerable site. This can lead to unauthorized changes in the plugin's configuration and injection of malicious scripts (reflected XSS), exploiting CWE-80 (Improper Neutralization of Script-Related HTML Tags). The vulnerability affects all versions of the plugin up to and including version 1.0. The CVSS 3.1 base score is 6.1, reflecting a medium severity level, with the vector indicating network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity, with no impact on availability. Although no known exploits are reported in the wild, the vulnerability's nature allows attackers to leverage social engineering to compromise site administrators, potentially leading to site defacement, session hijacking, or distribution of malware via injected scripts. The scope change in CVSS indicates that the vulnerability can affect resources beyond the vulnerable component, such as other parts of the website or user sessions.

For European organizations, the impact of CVE-2025-11992 can be significant, especially for those relying on WordPress sites with the vulnerable Multi Item Responsive Slider plugin installed. Successful exploitation can lead to unauthorized modification of plugin settings and injection of malicious scripts, which may result in data leakage, session hijacking, or distribution of malware to site visitors. This compromises the confidentiality and integrity of the website and its users. While availability is not directly impacted, reputational damage and loss of customer trust can have indirect financial consequences. Organizations in sectors such as e-commerce, media, and public services, where WordPress is widely used, are particularly vulnerable. The requirement for user interaction (administrator clicking a malicious link) means that phishing or social engineering campaigns could be used as attack vectors. Given the widespread use of WordPress across Europe, the vulnerability poses a moderate risk that should be addressed promptly to prevent exploitation.

To mitigate CVE-2025-11992, organizations should take the following specific actions: 1) Immediately update the Multi Item Responsive Slider plugin once a patched version is released by the vendor. In the absence of a patch, consider temporarily disabling or removing the plugin to eliminate the attack surface. 2) Implement strict access controls to the WordPress administrative dashboard, including limiting administrator privileges to trusted personnel only. 3) Employ Web Application Firewalls (WAFs) with rules designed to detect and block CSRF attack patterns targeting the 'mioptions.php' page. 4) Educate site administrators about the risks of phishing and social engineering, emphasizing caution when clicking on unsolicited links or opening suspicious emails. 5) Enable multi-factor authentication (MFA) for all administrative accounts to reduce the risk of account compromise. 6) Monitor website logs for unusual POST requests or changes to plugin settings that could indicate attempted exploitation. 7) Review and harden nonce implementation in custom plugins or themes to ensure proper validation of sensitive requests. 8) Regularly audit installed plugins and remove any that are outdated or no longer maintained to reduce exposure to similar vulnerabilities.