CVE-2025-15486 is a stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79 found in the Kunze Law plugin for WordPress, affecting all versions up to and including 2.1. The vulnerability stems from the plugin's behavior of fetching HTML content from a remote server and injecting it directly into WordPress pages without any sanitization or escaping. This unsafe practice allows an authenticated attacker with Administrator-level privileges or higher to inject arbitrary JavaScript code into pages. The malicious scripts execute whenever any user accesses the compromised page, potentially leading to session hijacking, privilege escalation, or data theft. The vulnerability specifically affects multisite WordPress installations or those where the unfiltered_html capability is disabled, limiting the attack surface but still significant in such environments. Furthermore, the plugin contains a path traversal vulnerability in the shortcode name parameter, which can be exploited to write malicious HTML files to arbitrary writable locations on the server, potentially enabling persistent backdoors or defacement. The CVSS 3.1 base score is 4.4 (medium severity), reflecting the network attack vector, high attack complexity, required privileges, no user interaction, and limited confidentiality and integrity impact without availability impact. No public exploits are known at this time, but the presence of multiple vulnerabilities increases the risk profile. The vulnerability was published in January 2026 and assigned by Wordfence. No official patches or fixes are currently linked, indicating that mitigation relies on access control and plugin deactivation.

For European organizations, the impact of CVE-2025-15486 can be significant, particularly for entities using multisite WordPress installations with the Kunze Law plugin. The stored XSS vulnerability allows attackers with administrator privileges to inject malicious scripts that execute in the context of users visiting affected pages, potentially compromising user credentials, session tokens, or performing unauthorized actions on behalf of users. This threatens confidentiality and integrity of data managed via the affected WordPress sites. The path traversal vulnerability further exacerbates risk by enabling attackers to write arbitrary HTML files, possibly leading to persistent webshells or defacement, which can damage organizational reputation and trust. Given that the plugin is related to legal services, compromised sites could expose sensitive legal information or client data, raising compliance and privacy concerns under GDPR. The requirement for administrator privileges limits the threat to insider threats or compromised admin accounts, but the impact remains serious if exploited. No direct availability impact is noted, but indirect effects such as site defacement or loss of trust could disrupt operations. Organizations in sectors like legal, governmental, and regulated industries in Europe are particularly sensitive to such vulnerabilities due to the nature of their data and regulatory obligations.

To mitigate CVE-2025-15486, European organizations should take several specific steps beyond generic advice: 1) Immediately audit and restrict administrator-level access to the WordPress multisite installations using the Kunze Law plugin, ensuring only trusted personnel have such privileges. 2) Disable or uninstall the Kunze Law plugin until an official patch or update addressing these vulnerabilities is released. 3) Implement strict file system permissions to prevent unauthorized writing to arbitrary locations, mitigating the path traversal exploitation. 4) Monitor web server logs and WordPress activity logs for unusual shortcode usage patterns or unexpected file creations indicative of exploitation attempts. 5) Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious shortcode parameters or injected scripts. 6) Educate administrators on the risks of installing plugins from untrusted sources and the importance of timely updates. 7) Review multisite configuration and consider isolating critical sites to minimize cross-site contamination. 8) Prepare incident response plans specific to web application compromises involving stored XSS and file write vulnerabilities. 9) Once available, promptly apply vendor patches or updates to the Kunze Law plugin. 10) Conduct regular security assessments and penetration tests focusing on WordPress plugins and multisite configurations.