Stored XSS in Themefic Hydra Booking

Executive Summary

This vulnerability is a Stored Cross-site Scripting (XSS) issue in Themefic Hydra Booking up to version 1.1.44. It occurs due to improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that are stored and later executed in the context of users visiting the affected web pages.

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Detection Guidance

Detecting this stored Cross-Site Scripting (XSS) vulnerability in the Hydra Booking plugin (versions <= 1.1.44) requires checking for malicious input or payloads stored in the application's database or web pages. Since this is a web application vulnerability, network-based detection may not be straightforward, but you can follow these steps:

• Inspect the Hydra Booking plugin installation: Verify the plugin version by checking the plugin directory or WordPress admin dashboard. Versions <= 1.1.44 are affected.
• Review web application logs: Look for suspicious input patterns, such as script tags (<script>), event handlers (onerror=, onclick=), or other JavaScript payloads in HTTP requests targeting the Hydra Booking plugin.
• Manually test for stored XSS: Submit test payloads (e.g., <script>alert(1)</script>) in input fields handled by the plugin (e.g., booking forms, user profiles) and check if they are rendered unsanitized in subsequent page loads.
• Use a web vulnerability scanner: Tools like OWASP ZAP, Burp Suite, or commercial scanners can automate the detection of stored XSS vulnerabilities in web applications.
• Check database entries: If you have access to the database, search for stored JavaScript payloads in tables associated with the Hydra Booking plugin (e.g., wp_posts, wp_options, or custom tables created by the plugin).

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Impact Analysis

The vulnerability can lead to several impacts including unauthorized actions performed on behalf of users, theft of sensitive information such as cookies or session tokens, and potential compromise of user accounts. It can also affect the availability and integrity of the affected system.

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Compliance Impact

The vulnerability described (CVE-2026-57388) is a Stored Cross-Site Scripting (XSS) issue in the Hydra Booking plugin. This type of vulnerability can have implications for compliance with standards and regulations such as GDPR and HIPAA, depending on the context in which the affected software is used.

• GDPR: If the vulnerable plugin is used on a website that processes personal data of EU citizens, a Stored XSS vulnerability could lead to unauthorized access or exfiltration of personal data. Under GDPR, organizations must implement appropriate technical measures to protect personal data. Failure to address such vulnerabilities could result in non-compliance, potentially leading to fines or other penalties.
• HIPAA: If the plugin is used in a healthcare-related context (e.g., booking systems for medical appointments) and handles protected health information (PHI), the vulnerability could expose PHI to unauthorized parties. HIPAA requires safeguards to ensure the confidentiality, integrity, and availability of PHI. A Stored XSS vulnerability could violate these requirements, leading to compliance violations.

Additionally, the CVSS score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L) indicates that the vulnerability is of medium severity but can be exploited remotely without authentication, posing a risk to data security and regulatory compliance.

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Mitigation Strategies

To mitigate this stored XSS vulnerability in the Hydra Booking plugin, take the following immediate steps:

• Update the plugin: If a patched version of Hydra Booking is available, upgrade to the latest version immediately to resolve the vulnerability.
• Disable the plugin: If no patch is available, disable the Hydra Booking plugin until a fix is released to prevent exploitation.
• Implement a Web Application Firewall (WAF): Configure a WAF to block malicious input patterns, such as script tags or JavaScript payloads, targeting the plugin.
• Sanitize user input: If you have access to the plugin's source code, ensure all user-supplied input is properly sanitized and escaped before being stored or rendered in web pages.
• Monitor for exploitation: Review web server logs and database entries for signs of XSS payloads or unauthorized script execution.
• Educate users: Inform users about the risks of XSS and advise them to avoid clicking on suspicious links or interacting with untrusted content.

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