CVE-2025-11810 is a stored cross-site scripting vulnerability identified in the Print Button Shortcode plugin for WordPress, affecting all versions up to and including 1.0.1. The root cause is insufficient sanitization and escaping of user input specifically in the 'target' attribute of the 'print-button' shortcode. Authenticated users with contributor-level permissions or higher can exploit this flaw by injecting arbitrary JavaScript code into pages or posts. Because the vulnerability is stored, the malicious script persists in the WordPress database and executes in the browsers of any users who visit the infected page, potentially compromising user sessions, stealing cookies, or performing unauthorized actions on behalf of users. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting medium severity, with an attack vector of network (remote), low attack complexity, requiring privileges (contributor or above), no user interaction, and a scope change (impacting other components). Although no public exploits have been reported yet, the vulnerability poses a significant risk due to the common use of WordPress and the plugin’s functionality. The flaw highlights the importance of proper input validation and output encoding in web applications, especially in plugins that extend CMS functionality. The vulnerability was published on October 22, 2025, and no patches or updates are currently linked, indicating that users must monitor vendor advisories for fixes.

For European organizations, this vulnerability can lead to unauthorized script execution on their WordPress sites, potentially resulting in session hijacking, data theft, defacement, or distribution of malware to site visitors. Organizations with multi-user WordPress environments, such as media companies, educational institutions, and e-commerce businesses, are particularly at risk because contributors with limited privileges can exploit the flaw. The compromise of user sessions or administrative accounts could lead to broader network access or data breaches. Additionally, reputational damage and regulatory consequences under GDPR may arise if customer data is exposed or if the site is used to distribute malicious content. The medium severity score reflects that while the vulnerability requires authenticated access, the impact on confidentiality and integrity is significant, and the scope extends beyond the initial component to users interacting with the site.

1. Immediately restrict contributor and higher-level user permissions to trusted individuals only until a patch is available. 2. Monitor the Print Button Shortcode plugin vendor channels for security updates and apply patches promptly once released. 3. Implement web application firewalls (WAFs) with rules to detect and block XSS payloads targeting the 'target' attribute or shortcode parameters. 4. Conduct regular security audits of WordPress plugins and user-generated content for suspicious scripts or anomalies. 5. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected sites. 6. Educate content contributors about safe input practices and the risks of injecting untrusted code. 7. Consider temporarily disabling or replacing the vulnerable plugin with alternative functionality if patching is delayed. 8. Use security plugins that provide real-time scanning and alerting for XSS and other injection attacks.