CVE-2025-11830 identifies a stored Cross-Site Scripting (XSS) vulnerability in the WP Restaurant Listings plugin for WordPress, specifically in the handling of the 'align' parameter within the restaurant_summary shortcode. This vulnerability exists in all versions up to and including 1.0.2 due to insufficient input sanitization and output escaping, allowing malicious scripts to be stored persistently in the website's content. An attacker with authenticated contributor-level access or higher can exploit this flaw by injecting arbitrary JavaScript code into the 'align' parameter, which is then rendered on pages viewed by other users, including administrators and visitors. The vulnerability is classified under CWE-79, reflecting improper neutralization of input during web page generation. The CVSS 3.1 base score of 6.4 reflects a medium severity with a network attack vector, low attack complexity, requiring privileges but no user interaction, and a scope change indicating that the vulnerability affects components beyond the initially vulnerable plugin. The impact includes partial loss of confidentiality and integrity, such as theft of cookies, session tokens, or execution of unauthorized actions on behalf of users. No public exploits have been reported yet, but the vulnerability poses a significant risk in environments where multiple users have contributor or higher privileges. The lack of available patches at the time of publication necessitates immediate mitigation efforts by administrators.

The exploitation of CVE-2025-11830 can have several adverse effects on organizations running WordPress sites with the WP Restaurant Listings plugin. Attackers with contributor-level access can inject malicious scripts that execute in the browsers of users who visit the affected pages, potentially leading to session hijacking, credential theft, unauthorized actions, or defacement. This compromises the confidentiality and integrity of user data and site content. Although availability is not directly impacted, the reputational damage and loss of user trust can be significant. Organizations with multiple contributors or editors are at higher risk, as the attacker requires authenticated access. The vulnerability could be leveraged to escalate privileges or pivot to other attacks within the network. Given WordPress's widespread use globally, especially in small to medium businesses and hospitality sectors using restaurant listing plugins, the threat could affect a broad range of websites, leading to data breaches and operational disruptions.

To mitigate CVE-2025-11830, organizations should first check for and apply any available updates or patches from the WP Restaurant Listings plugin vendor as soon as they are released. In the absence of official patches, administrators should restrict contributor-level access to trusted users only and audit existing user roles to minimize the attack surface. Implementing a Web Application Firewall (WAF) with rules to detect and block malicious script payloads in HTTP requests can reduce exploitation risk. Additionally, applying strict Content Security Policy (CSP) headers can help prevent execution of injected scripts. Site administrators should sanitize and validate all user inputs rigorously, especially those related to shortcode parameters. Regular security scanning and monitoring for unusual activity or injected scripts in site content are recommended. Finally, educating content contributors about secure input practices and monitoring plugin usage can further reduce risk.