CVE-2026-6820 in VikBooking Plugin
Summary
by MITRE • 07/08/2026
The VikBooking Hotel Booking Engine & PMS plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'email' parameter in all versions up to, and including, 1.8.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 07/08/2026
The VikBooking Hotel Booking Engine & PMS plugin for WordPress represents a critical security vulnerability through its susceptibility to stored cross-site scripting attacks. This flaw exists within all versions up to and including 1.8.8, where the plugin fails to properly sanitize user input or escape output when processing the 'email' parameter. The vulnerability stems from inadequate validation mechanisms that allow malicious actors to inject harmful scripts directly into the plugin's data handling processes.
The technical implementation of this vulnerability enables attackers to store malicious JavaScript code within the plugin's database through the email parameter field. When legitimate users access pages containing this injected content, the stored scripts execute in their browsers without any authentication requirements. This makes the vulnerability particularly dangerous as it requires no privileged access or user interaction beyond visiting infected pages. The flaw operates at the application layer and affects all users who encounter the maliciously injected content within the plugin's interface.
From an operational perspective, this vulnerability creates significant risks for hotel booking systems and property management operations. Attackers can leverage stored XSS to steal session cookies, redirect users to malicious websites, perform actions on behalf of authenticated users, or even escalate privileges within the WordPress environment. The impact extends beyond simple script execution as it can compromise entire user sessions and potentially allow for further exploitation of the underlying WordPress installation. The vulnerability affects any system utilizing the affected plugin version regardless of the specific hotel booking engine configuration.
Security professionals should consider this vulnerability in relation to CWE-79, which specifically addresses cross-site scripting flaws, and its mapping to ATT&CK technique T1566 for social engineering through malicious content delivery. Mitigation strategies include immediate patching to versions beyond 1.8.8 where the sanitization issues have been resolved. Organizations should also implement input validation measures at multiple layers including database field restrictions and output encoding practices. Additionally, network monitoring should be enhanced to detect suspicious script injection patterns and regular security audits should verify that all plugin components properly handle user input through appropriate sanitization techniques.
The vulnerability demonstrates how seemingly simple parameter handling can create substantial security exposure in web applications. Proper implementation of the principle of least privilege and defense in depth approaches would have prevented this issue from manifesting as a persistent threat within the system's data flow processes. System administrators should also consider implementing content security policies to limit script execution capabilities and establish comprehensive monitoring procedures for detecting unauthorized modifications to plugin components.