CVE-2025-11804 is a stored Cross-Site Scripting (XSS) vulnerability identified in the JB News Ticker plugin for WordPress, affecting all versions up to and including 1.0. The root cause is insufficient sanitization and output escaping of the 'id' shortcode attribute within the 'jbticker' shortcode, which allows authenticated users with contributor-level privileges or higher to inject arbitrary JavaScript code into pages. When other users access these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, defacement, or unauthorized actions performed on behalf of the victim. The vulnerability is exploitable remotely over the network without user interaction, but requires the attacker to have at least contributor-level authentication on the WordPress site. The CVSS v3.1 score of 6.4 reflects medium severity, with the attack vector being network-based, low attack complexity, privileges required, no user interaction, and a scope change due to impact on other users. No patches or official fixes are currently linked, and no known exploits have been reported in the wild. The vulnerability falls under CWE-79, which is a common and well-understood class of web application security issues related to improper neutralization of input during web page generation. Exploitation could lead to compromise of user confidentiality and integrity, but does not affect availability. Given the widespread use of WordPress and the popularity of news ticker plugins for content display, this vulnerability presents a tangible risk to websites using JB News Ticker, especially those with multiple contributors or editors.

For European organizations, this vulnerability can lead to unauthorized script execution within the context of affected WordPress sites, potentially compromising user sessions, stealing sensitive information, or enabling further attacks such as privilege escalation or phishing. Organizations relying on JB News Ticker for dynamic content display on their websites risk reputational damage and data breaches if exploited. Since the vulnerability requires contributor-level access, insider threats or compromised contributor accounts pose a significant risk. The impact is particularly relevant for media companies, e-commerce sites, and public-facing portals that use WordPress and the vulnerable plugin. Confidentiality and integrity of user data and site content are at risk, although availability is not directly impacted. The vulnerability could also be leveraged to distribute malware or redirect users to malicious sites, amplifying the threat. Given the interconnected nature of European digital infrastructure and regulatory frameworks like GDPR, exploitation could lead to compliance violations and financial penalties.

Immediate mitigation should include restricting contributor-level access to trusted users only and monitoring for suspicious shortcode usage or unexpected content injections. Site administrators should disable or remove the JB News Ticker plugin until a patch or update is released. Implementing Web Application Firewalls (WAFs) with custom rules to detect and block malicious shortcode payloads can reduce risk. Regularly auditing user roles and permissions to minimize unnecessary contributor access is critical. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. Additionally, site owners should sanitize and validate all shortcode attributes manually if custom development is involved. Monitoring site logs for unusual activity related to shortcode usage can help detect exploitation attempts early. Once a vendor patch is available, prompt application of updates is essential. Backup procedures should be reviewed to ensure rapid recovery in case of compromise.