CVE-2025-47500 identifies a Stored Cross-Site Scripting (XSS) vulnerability in the Benjamin Intal Stackable WordPress plugin, versions up to and including 3.19.5. The flaw stems from improper neutralization of user-supplied input during the generation of web pages, which allows an attacker with at least low-level privileges (e.g., contributor or editor roles) to inject malicious JavaScript payloads that are stored persistently within the website's content. When other users view the affected pages, the malicious scripts execute in their browsers under the context of the vulnerable site, potentially leading to session hijacking, unauthorized actions, or data theft. The vulnerability requires user interaction, such as a victim visiting a compromised page, and the attacker must have some authenticated access to inject the payload. The CVSS v3.1 score is 5.4 (medium), reflecting the network attack vector, low attack complexity, required privileges, and user interaction, with impacts limited to confidentiality and integrity but no availability impact. No public exploits have been reported yet, but the vulnerability is published and should be addressed promptly. The plugin is widely used in WordPress environments to enhance Gutenberg block functionality, making it a relevant target for attackers seeking to compromise content management systems.

For European organizations, this vulnerability poses a moderate risk primarily to websites using the Stackable plugin on WordPress platforms. Successful exploitation could lead to unauthorized disclosure of sensitive information such as session tokens or user data, manipulation of website content, and potential phishing or social engineering attacks leveraging the compromised site. While the impact on availability is negligible, the breach of confidentiality and integrity can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR), and cause financial losses. Organizations with multi-user content management workflows are particularly vulnerable, as attackers need authenticated access to inject malicious scripts. The threat is heightened in sectors with high digital engagement such as e-commerce, media, and public services. Given the widespread use of WordPress across Europe, the vulnerability could affect a significant number of sites if unpatched.

1. Monitor for and apply security patches or updates from Benjamin Intal as soon as they are released to remediate the vulnerability. 2. Restrict user roles and permissions to the minimum necessary, especially limiting who can add or edit content blocks in WordPress. 3. Implement strong input validation and sanitization on all user inputs, particularly those that generate web page content. 4. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5. Conduct regular security audits and code reviews of custom blocks or plugins integrated with Stackable to detect similar issues. 6. Educate content editors and administrators about the risks of XSS and safe content management practices. 7. Use Web Application Firewalls (WAFs) with rules designed to detect and block XSS payloads targeting WordPress sites. 8. Monitor logs for suspicious activity indicative of attempted exploitation, such as unusual content submissions or script injections.