Executive Summary

CVE-2025-11496 is a Stored Cross-Site Scripting (XSS) vulnerability in the Five Star Restaurant Reservations WordPress plugin. It occurs via the 'rtb-name' parameter due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject malicious scripts that execute when users access affected pages. The vulnerability was fixed in version 2.7.7 by implementing stricter input filtering using a regular expression that only allows Unicode letters, numbers, marks, apostrophes, hyphens, and whitespace, and by properly escaping output in the plugin's code. [1]

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Impact Analysis

This vulnerability can allow attackers to inject arbitrary web scripts into pages viewed by users, potentially leading to theft of user data, session hijacking, or other malicious actions executed in the context of the affected website. Since the attack can be performed by unauthenticated users, it poses a significant risk to website visitors and administrators, potentially compromising user trust and site security. [1]

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Detection Guidance

You can detect this vulnerability by checking the version of the Five Star Restaurant Reservations WordPress plugin installed on your system. Versions up to and including 2.7.5 are vulnerable. To detect potential exploitation attempts, monitor HTTP requests for suspicious or malicious payloads in the 'rtb-name' parameter, which may contain script tags or unusual characters. For example, you can use web server logs or network monitoring tools to search for requests containing '<script>' or other suspicious input in the 'rtb-name' parameter. A sample command to search Apache logs for suspicious 'rtb-name' parameter usage could be: grep -i 'rtb-name=.*<script' /var/log/apache2/access.log. Additionally, ensure your plugin version is 2.7.7 or later, which contains the fix. [1]

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Mitigation Strategies

The immediate step to mitigate this vulnerability is to update the Five Star Restaurant Reservations WordPress plugin to version 2.7.7 or later, which includes the fix for CVE-2025-11496. This update improves input sanitization and output escaping to prevent stored cross-site scripting attacks. Until the update is applied, consider implementing web application firewall (WAF) rules to block suspicious input in the 'rtb-name' parameter and monitor for exploitation attempts. [1]

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