CVE-2026-11392: WP Hotel Booking Plugin XSS Vulnerability

CVE-2026-11392 Overview

CVE-2026-11392 is a Reflected Cross-Site Scripting (XSS) vulnerability [CWE-79] in the WP Hotel Booking plugin for WordPress. The flaw affects all versions up to and including 2.3.1. It stems from insufficient input sanitization and output escaping of the check_in_date and check_out_date request parameters. Unauthenticated attackers can inject arbitrary web scripts into rendered pages. Exploitation requires user interaction, such as clicking a crafted link. Successful exploitation executes attacker-controlled JavaScript in the victim's browser session on the vulnerable site.

Critical Impact
Unauthenticated attackers can execute arbitrary JavaScript in a victim's browser context, enabling session theft, credential harvesting, and administrative account takeover if an authenticated admin follows a crafted link.

Affected Products

WP Hotel Booking plugin for WordPress, versions up to and including 2.3.1
Elementor room archive widget shipped with the plugin (list-results-room.php)
Search result templates templates/search/loop.php and templates/search/v2/loop-v2.php

Discovery Timeline

2026-07-10 - CVE-2026-11392 published to NVD
2026-07-14 - Last updated in NVD database

Technical Details for CVE-2026-11392

Vulnerability Analysis

The WP Hotel Booking plugin accepts booking date values from HTTP request parameters and reflects them into rendered HTML output. The check_in_date and check_out_date values flow from user-controlled input into search result templates and Elementor widget output without proper escaping. Because the reflected values appear inside HTML contexts, an attacker who crafts a malicious URL and convinces a user to visit it triggers script execution in the victim's browser under the site's origin.

The attack requires user interaction and no authentication, and the scope changes from the vulnerable component to the browser executing the payload. Impact is limited to confidentiality and integrity within the browser session; availability is not affected.

Root Cause

The vulnerability originates in the helper and template code paths that read booking date parameters and echo them without applying WordPress escaping functions such as esc_attr() or esc_html(). Affected source locations include includes/class-wphb-helpers.php, includes/wphb-functions.php, includes/elementor/widgets/archive-room/list-results-room.php, templates/search/loop.php, and templates/search/v2/loop-v2.php. Version 2.3.2 introduces sanitization at the corresponding lines.

Attack Vector

An attacker crafts a URL to a page rendered by the WP Hotel Booking plugin, appending a malicious payload in the check_in_date or check_out_date query parameter. The attacker delivers the link via phishing email, social media, or a compromised third-party site. When a user opens the link, the plugin reflects the payload into the page, and the browser executes the injected script. If the victim holds an authenticated WordPress session, the attacker can perform actions on behalf of that user, including exfiltrating cookies or issuing administrative requests.

See the Wordfence Vulnerability Report for reflected parameter details and the WordPress Search Loop Template source reference.

Detection Methods for CVE-2026-11392

Indicators of Compromise

HTTP requests to WP Hotel Booking search or room archive endpoints containing <script, javascript:, onerror=, or onload= inside check_in_date or check_out_date parameters.
URL-encoded XSS payloads such as %3Cscript%3E or %22%3E%3Cimg present in referer logs pointing to plugin pages.
Unexpected outbound requests from browsers loading hotel booking pages to attacker-controlled domains.

Detection Strategies

Inspect web server access logs and WAF telemetry for query strings targeting check_in_date and check_out_date with HTML or JavaScript metacharacters.
Deploy a WordPress-aware WAF rule set that blocks reflected XSS payloads on plugin search endpoints prior to patching.
Correlate anomalous browser-side script execution or Content Security Policy (CSP) violations with visits to hotel booking pages.

Monitoring Recommendations

Enforce Content Security Policy headers and alert on CSP violation reports originating from booking pages.
Monitor administrator session activity for unusual actions shortly after visits to plugin-rendered URLs containing suspicious parameters.
Track plugin version inventory across managed WordPress sites and flag installations below 2.3.2.

How to Mitigate CVE-2026-11392

Immediate Actions Required

Upgrade the WP Hotel Booking plugin to version 2.3.2 or later on all WordPress installations.
Audit administrator accounts and rotate credentials if suspicious activity is observed following a click on a booking URL.
Deploy WAF rules that block script tags and JavaScript event handlers in check_in_date and check_out_date parameters until the patch is applied.

Patch Information

The vendor addressed the issue in WP Hotel Booking 2.3.2. Patched code paths are visible in the updated Room Archive Widget, Search Loop Template, and V2 Search Loop. Administrators should verify the installed version through the WordPress plugins dashboard after applying updates.

Workarounds

Restrict access to hotel booking search pages using authentication or IP allowlists if immediate patching is not feasible.
Configure a strict Content Security Policy that disallows inline scripts on pages rendered by the plugin.
Temporarily deactivate the WP Hotel Booking plugin until it is upgraded to 2.3.2 or later.

bash

# Configuration example: WP-CLI update and version verification
wp plugin update wp-hotel-booking --version=2.3.2
wp plugin get wp-hotel-booking --field=version