CVE-2025-47499 is a security vulnerability classified as CWE-79, indicating an improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). This specific vulnerability affects the 'Simple Blog Stats' plugin developed by Jeff Starr. The vulnerability allows an attacker to inject malicious scripts that are stored persistently (Stored XSS) within the application. When other users or administrators access the affected pages, the malicious script executes in their browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. The vulnerability exists in all versions of Simple Blog Stats up to and including the version released on 2025-04-16. The CVSS v3.1 base score is 6.5, indicating a medium severity level. The vector string (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) reveals that the attack can be executed remotely over the network with low attack complexity, requires low privileges, and user interaction is necessary. The scope is changed, meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality, integrity, and availability is low to moderate. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability is significant because it targets a widely used WordPress plugin that provides blog statistics, which is often installed on websites to monitor traffic. Stored XSS vulnerabilities are particularly dangerous as they can affect multiple users and persist until the malicious input is removed or the vulnerability is patched.

For European organizations, the impact of this vulnerability can be substantial, especially for those relying on WordPress sites with the Simple Blog Stats plugin installed. Exploitation could lead to unauthorized access to user sessions, theft of sensitive information such as login credentials, and potential defacement or manipulation of website content. This can damage organizational reputation, lead to data breaches, and cause compliance issues under regulations like GDPR due to unauthorized data exposure. Additionally, attackers could leverage the vulnerability to pivot into internal networks if administrative users are compromised. The requirement for low privileges and user interaction means that targeted phishing or social engineering could facilitate exploitation. Given the widespread use of WordPress in Europe, including by SMEs and public sector entities, the risk is non-trivial. However, the absence of known active exploits reduces immediate risk, though proactive mitigation is advised.

Organizations should immediately audit their WordPress installations to identify the presence of the Simple Blog Stats plugin. If found, they should monitor for updates or patches from the vendor and apply them promptly once available. In the interim, consider disabling or removing the plugin to eliminate exposure. Web application firewalls (WAFs) can be configured to detect and block typical XSS payloads targeting this plugin’s input fields. Implement strict Content Security Policy (CSP) headers to restrict script execution sources, reducing the impact of potential XSS payloads. Additionally, review and harden user privileges to minimize the number of users with low privileges who can input data that is rendered without proper sanitization. Regular security training to raise awareness about phishing and social engineering can reduce the likelihood of user interaction facilitating exploitation. Finally, conduct thorough input validation and output encoding on all user-supplied data within the website environment to prevent similar vulnerabilities.