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 vulnerability arises from improper neutralization of input during web page generation, specifically due to insufficient sanitization and escaping of the 'id' attribute in the 'jbticker' shortcode. Authenticated users with contributor-level access or higher can exploit this flaw by injecting arbitrary JavaScript code into the 'id' shortcode attribute. Because the injected script is stored, it executes in the browsers of any users who visit the compromised page, potentially leading to session hijacking, defacement, or redirection to malicious sites. The vulnerability has a CVSS v3.1 base score of 6.4, reflecting medium severity, with an attack vector of network, low attack complexity, and requiring privileges at the contributor level but no user interaction. The scope is changed, indicating that the vulnerability can affect resources beyond the vulnerable component. No public exploits have been reported yet, but the risk remains significant due to the ease of exploitation by authenticated users and the potential impact on site visitors. The vulnerability is classified under CWE-79, which covers improper neutralization of input leading to XSS. The plugin is widely used in WordPress environments, which are prevalent across many European organizations, especially in SMBs and media sectors. No official patch links are currently available, emphasizing the need for interim mitigations.

For European organizations, this vulnerability poses a risk primarily to websites using the JB News Ticker plugin on WordPress, which is common among small to medium enterprises, news outlets, and content publishers. Exploitation can lead to unauthorized script execution in users' browsers, potentially compromising user credentials, session tokens, and enabling phishing or malware distribution. This can damage organizational reputation, lead to data breaches, and violate GDPR requirements concerning user data protection. The requirement for contributor-level access means insider threats or compromised accounts can be leveraged to exploit this vulnerability. Given the widespread use of WordPress in Europe, especially in countries with strong digital media sectors, the potential impact includes loss of customer trust and regulatory penalties. The vulnerability does not affect availability directly but compromises confidentiality and integrity of user interactions with affected sites.

Immediate mitigation steps include restricting contributor-level access to trusted users only and auditing existing contributor accounts for suspicious activity. Site administrators should implement additional input validation and output encoding on the 'id' shortcode attribute if custom code modifications are possible. Employing Web Application Firewalls (WAFs) with rules to detect and block malicious script injections targeting the 'jbticker' shortcode can reduce risk. Monitoring site content for unauthorized script insertions and conducting regular security audits are recommended. Once an official patch or update is released by the vendor, prompt application is critical. Additionally, educating content contributors about safe input practices and the risks of injecting untrusted content can help prevent exploitation. Backup and incident response plans should be reviewed to ensure rapid recovery if exploitation occurs.