CVE-2025-11747 identifies a stored Cross-Site Scripting (XSS) vulnerability in the Colibri Page Builder plugin for WordPress, specifically in the colibri_blog_posts shortcode. This vulnerability arises from improper neutralization of input during web page generation (CWE-79), where user-supplied attributes are not adequately sanitized or escaped before being rendered. As a result, authenticated attackers with contributor-level access or higher can inject arbitrary JavaScript code into pages. When other users access these pages, the malicious scripts execute in their browsers, potentially leading to session hijacking, privilege escalation, or unauthorized actions within the context of the affected website. The vulnerability affects all versions up to and including 1.0.345. The CVSS v3.1 base score is 6.4, reflecting a medium severity with network attack vector, low attack complexity, requiring privileges but no user interaction, and impacting confidentiality and integrity with a scope change. No public exploits have been reported to date. The vulnerability was reserved in October 2025 and published in December 2025. The lack of patch links suggests that a fix may not yet be available, emphasizing the need for immediate mitigation. This issue is particularly critical for websites relying on the Colibri Page Builder plugin, as it allows relatively low-privileged users to compromise site integrity and user trust.

For European organizations, this vulnerability can lead to significant risks including unauthorized access to user sessions, theft of sensitive information, and potential defacement or manipulation of website content. Since WordPress powers a large portion of websites in Europe, and Colibri Page Builder is a popular plugin, many organizations—especially SMEs and content-driven businesses—could be affected. Exploitation could damage brand reputation, lead to regulatory non-compliance (e.g., GDPR breaches if personal data is exposed), and disrupt business operations. The requirement for contributor-level access limits the attack surface but insider threats or compromised accounts increase risk. The scope change in CVSS indicates that the vulnerability could affect components beyond the initially targeted plugin, potentially impacting other integrated systems or plugins. The absence of known exploits reduces immediate risk but also means organizations should act proactively before attackers develop weaponized code.

Organizations should immediately audit their WordPress installations to identify the presence and version of the Colibri Page Builder plugin. Until an official patch is released, restrict contributor-level and higher privileges to trusted users only, and monitor for unusual activity from these accounts. Implement Web Application Firewall (WAF) rules to detect and block suspicious inputs targeting the colibri_blog_posts shortcode parameters. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. Regularly back up website data and test restoration procedures. Educate content contributors about the risks of injecting untrusted content. Once a patch becomes available, prioritize its deployment. Additionally, consider disabling or replacing the plugin if immediate patching is not feasible. Conduct thorough security reviews of all plugins and themes to reduce attack surface.