CVE-2025-14147 identifies a stored Cross-Site Scripting (XSS) vulnerability in the Easy GitHub Gist Shortcodes WordPress plugin developed by corsonr. This vulnerability arises from improper neutralization of input during web page generation, specifically through the 'id' parameter of the gist shortcode. The plugin fails to adequately sanitize and escape user-supplied input, allowing authenticated users with Contributor-level access or higher to inject arbitrary JavaScript code into pages. Because the malicious script is stored, it executes every time a user accesses the infected page, potentially compromising user sessions, stealing cookies, or performing unauthorized actions on behalf of the user. The CVSS 3.1 base score is 6.4, reflecting a medium severity with a network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), and a scope change (S:C) affecting confidentiality and integrity but not availability. Although no public exploits are currently known, the vulnerability poses a significant risk to WordPress sites using this plugin, especially those with multiple contributors who can post content. The lack of available patches at the time of publication necessitates immediate mitigation steps to reduce exposure.

For European organizations, this vulnerability could lead to unauthorized script execution on their WordPress sites, resulting in session hijacking, data theft, defacement, or unauthorized actions performed by attackers masquerading as legitimate users. Organizations relying on the Easy GitHub Gist Shortcodes plugin for content embedding are particularly vulnerable if they allow contributor-level users to add or edit content. The compromise of user sessions or administrative accounts could lead to broader network infiltration or data breaches. Given the widespread use of WordPress across Europe, especially in sectors like media, education, and government, the impact could be significant if exploited. The vulnerability does not affect availability but threatens confidentiality and integrity of web content and user data. The medium severity score suggests a moderate risk, but the ease of exploitation by authenticated users and the stored nature of the XSS increase the potential damage scope.

European organizations should immediately audit their WordPress installations to identify the presence of the Easy GitHub Gist Shortcodes plugin and restrict contributor-level access to trusted users only. Implement strict content review processes to detect and remove any malicious shortcode injections. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious shortcode parameters or script injections. Monitor logs for unusual shortcode usage or unexpected script execution patterns. Since no official patch is currently available, consider disabling or uninstalling the plugin until a secure version is released. Additionally, implement Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected sites. Educate contributors about secure content practices and the risks of injecting untrusted code. Finally, maintain regular backups and incident response plans to quickly recover from any compromise.