CVE-2026-57388 in Hydra Booking Plugin
Summary
by MITRE • 07/13/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Themefic Hydra Booking hydra-booking allows Stored XSS.This issue affects Hydra Booking: from n/a through <= 1.1.44.
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Analysis
by VulDB Data Team • 07/13/2026
This vulnerability represents a classic stored cross-site scripting flaw that undermines the security integrity of web applications by allowing malicious scripts to persist and execute within user sessions. The issue manifests in the Themefic Hydra Booking plugin where input validation mechanisms fail to properly sanitize user-supplied data before incorporating it into dynamically generated web pages. This weakness creates an environment where attackers can inject malicious javascript code that gets stored on the server and subsequently served to other users, making it a persistent threat that affects all versions up to and including 1.1.44.
The technical exploitation of this vulnerability follows the typical stored xss attack pattern where malicious input is accepted through forms or user-controllable fields within the booking system. When users interact with the compromised application, their browsers execute the injected scripts in the context of the vulnerable website, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of authenticated users. The vulnerability stems from inadequate input sanitization and output encoding practices that should follow established security frameworks such as those defined by the owasp xss prevention cheat sheet and cwe-79 which specifically addresses cross-site scripting vulnerabilities.
The operational impact of this stored xss vulnerability extends beyond simple data theft to encompass complete session compromise and potential privilege escalation within the affected system. Attackers can leverage this weakness to manipulate booking records, access sensitive customer information, or even gain administrative control over the booking platform if proper access controls are not in place. The persistence characteristic of stored xss means that once exploited, the malicious code continues to affect users until the vulnerability is patched and the injected content is removed from the system. This makes it particularly dangerous for business-critical applications like booking systems where user trust and data integrity are paramount.
Mitigation strategies should prioritize immediate patching of the affected plugin version to address the root cause of the input sanitization failure. Organizations must implement comprehensive output encoding mechanisms that properly escape special characters in all user-controllable inputs before rendering them in web pages. Additionally, content security policies should be enforced through proper http headers to limit script execution and reduce the impact of potential exploitation attempts. Security measures including regular input validation testing, automated scanning for xss vulnerabilities, and implementation of web application firewalls can provide additional layers of protection against similar attacks. The remediation process should also include thorough code review practices that align with security standards such as those outlined in the mitre attack framework for identifying and preventing persistent threats within web applications.
The vulnerability demonstrates how seemingly minor input validation oversights can create significant security risks in web applications, particularly those handling user-generated content. It underscores the critical importance of implementing defense-in-depth strategies that combine proper input sanitization with output encoding, access controls, and continuous monitoring to protect against persistent threats like stored cross-site scripting attacks that can compromise entire user sessions and data integrity within booking systems.