CVE-2025-11804 is a stored cross-site scripting (XSS) vulnerability identified in the JB News Ticker plugin for WordPress, a tool used to display news tickers on websites. The vulnerability exists in all versions up to and including 1.0 due to insufficient sanitization and escaping of the 'id' attribute within the 'jbticker' shortcode. This flaw allows authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code into pages or posts. When other users access these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation) and has a CVSS v3.1 base score of 6.4, reflecting a medium severity. The attack vector is network-based, requiring low attack complexity and privileges of a contributor, with no user interaction needed for exploitation. The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable plugin, impacting confidentiality and integrity but not availability. No patches or fixes are currently linked, and no known exploits have been reported in the wild as of the publication date. The vulnerability highlights the risks of insufficient input validation in WordPress plugins, especially those that allow user-generated content or shortcode attributes to be rendered without proper escaping.

The primary impact of this vulnerability is on the confidentiality and integrity of affected WordPress sites using the JB News Ticker plugin. An attacker 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 information such as cookies or credentials, and unauthorized actions performed with the victim's privileges. This can result in compromised user accounts, defacement, or further exploitation of the website. Although availability is not directly affected, the reputational damage and loss of user trust can be significant. Organizations relying on this plugin, especially those with multiple contributors or editors, face increased risk of insider threats or compromised contributor accounts being leveraged for attacks. The vulnerability's medium severity and ease of exploitation by authenticated users make it a credible threat vector for targeted attacks or automated exploitation in environments where contributor access is common.

To mitigate this vulnerability, organizations should first check for updates or patches from the plugin vendor and apply them immediately once available. In the absence of an official patch, administrators should restrict contributor-level access to trusted users only, minimizing the risk of malicious script injection. Implementing a Web Application Firewall (WAF) with rules to detect and block suspicious shortcode attribute inputs can provide temporary protection. Additionally, site administrators can audit existing content for injected scripts and sanitize or remove any suspicious shortcode usage. Employing security plugins that enforce strict input validation and output escaping for shortcodes can help prevent exploitation. Regular security training for contributors about the risks of injecting untrusted content and monitoring user activity logs for unusual behavior are also recommended. Finally, consider disabling or replacing the JB News Ticker plugin with a more secure alternative if immediate patching is not feasible.