CVE-2025-11767 identifies a stored cross-site scripting vulnerability in the Tips Shortcode plugin for WordPress, affecting all versions up to and including 0.2.1. The vulnerability stems from improper neutralization of input during web page generation, specifically within the 'tip' shortcode functionality. Authenticated users with contributor-level permissions or higher can inject arbitrary JavaScript code into pages by submitting crafted input that the plugin fails to sanitize or escape properly. When other users access these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, privilege escalation, or other malicious actions. The vulnerability is categorized under CWE-79, a common and well-understood class of web application security flaws. The CVSS 3.1 base score of 6.4 reflects a medium severity, with an attack vector of network, low attack complexity, requiring privileges but no user interaction, and a scope change indicating that the vulnerability affects components beyond the initially vulnerable plugin. No patches or updates are currently linked, and no known exploits have been reported in the wild as of the publication date. The vulnerability highlights the risks posed by insufficient input validation and output encoding in WordPress plugins, especially those that allow user-generated content to be embedded in pages.

The primary impact of this vulnerability is the potential for attackers with contributor-level access to inject malicious scripts that execute in the browsers of site visitors or administrators. This can lead to theft of authentication cookies, enabling session hijacking, unauthorized actions on behalf of users, or further exploitation of the WordPress environment. While availability is not directly affected, the integrity and confidentiality of user data and site content are at risk. Organizations relying on the Tips Shortcode plugin may face reputational damage, data breaches, or unauthorized administrative actions if exploited. Since contributor-level access is required, the threat is somewhat limited to environments where multiple users have such privileges or where accounts are compromised. However, in multi-user WordPress sites, especially those with less stringent access controls, the risk is significant. The vulnerability also increases the attack surface for chained attacks, where XSS is used as a stepping stone for more severe compromises.

To mitigate this vulnerability, organizations should first check for updates or patches from the plugin vendor and apply them promptly once available. In the absence of an official patch, administrators should consider disabling or removing the Tips Shortcode plugin if it is not essential. For sites requiring the plugin, implement strict user role management to limit contributor-level access only to trusted users. Employ Web Application Firewalls (WAFs) with rules designed to detect and block XSS payloads targeting the 'tip' shortcode parameters. Additionally, site administrators can implement content security policies (CSP) to restrict the execution of unauthorized scripts. Reviewing and sanitizing all user-generated content before it is saved or rendered can also reduce risk, potentially by customizing or extending the plugin code to enforce proper input validation and output escaping. Regular security audits and monitoring for unusual activity related to user accounts with contributor or higher privileges are recommended to detect exploitation attempts early.