CVE-2025-11870 identifies a stored Cross-Site Scripting (XSS) vulnerability in the Simple Business Data plugin for WordPress, developed by dmbarber. The vulnerability exists in all versions up to and including 1.0.1 due to improper neutralization of input during web page generation (CWE-79). Specifically, the plugin fails to properly sanitize or escape the 'type' attribute passed via the 'simple_business_data' shortcode, which is embedded directly into the HTML class attribute without adequate filtering. This allows an authenticated attacker with contributor-level or higher privileges to inject arbitrary JavaScript code into pages. Because the injected script is stored and rendered to any user visiting the page, it can lead to session hijacking, privilege escalation, or other malicious actions. The vulnerability requires no user interaction beyond visiting the compromised page and does not require higher privileges than contributor, which is a relatively low threshold in WordPress environments. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N) reflects network attack vector, low attack complexity, privileges required, no user interaction, scope change, and limited confidentiality and integrity impacts without affecting availability. No patches or exploits are currently publicly available, but the vulnerability is published and should be addressed promptly.

For European organizations, this vulnerability poses a moderate risk primarily to the confidentiality and integrity of WordPress-based websites using the Simple Business Data plugin. Attackers with contributor-level access can inject malicious scripts that execute in the browsers of site visitors or administrators, potentially leading to session hijacking, theft of sensitive data, or unauthorized actions performed on behalf of legitimate users. This can damage organizational reputation, lead to data breaches, and facilitate further attacks such as phishing or malware distribution. Since WordPress is widely used across Europe for business websites, especially among small and medium enterprises, the impact can be significant if exploited. However, the requirement for contributor-level access limits exploitation to insiders or compromised accounts, reducing the risk of widespread automated attacks. The vulnerability does not affect availability directly but can indirectly disrupt operations if exploited to compromise administrative accounts or deface websites.

European organizations should immediately audit their WordPress installations to identify the presence of the Simple Business Data plugin and its version. Since no official patches are currently available, mitigation should focus on restricting contributor-level access to trusted users only and monitoring for suspicious activity. Implementing a Web Application Firewall (WAF) with rules to detect and block malicious script injection attempts targeting shortcode attributes can reduce risk. Administrators should sanitize and validate all user inputs, especially those that influence HTML attributes, and consider disabling or removing the vulnerable plugin if it is not essential. Regularly updating WordPress core and plugins when patches become available is critical. Additionally, organizations should educate content contributors about the risks of injecting untrusted content and enforce the principle of least privilege to minimize the number of users with contributor or higher roles.