CVE-2025-58633: Booking Ultra Pro Stored XSS Vulnerability

CVE-2025-58633 Overview

CVE-2025-58633 is a stored cross-site scripting (XSS) vulnerability in the Deetronix Booking Ultra Pro plugin for WordPress. The flaw affects all versions of booking-ultra-pro up to and including 1.1.21. An authenticated attacker with low privileges can inject persistent JavaScript payloads that execute when other users, including administrators, load the affected page. The issue is tracked under CWE-79 and stems from improper neutralization of user-supplied input during web page generation.

Critical Impact
Persistent JavaScript execution in victim browsers can lead to session hijacking, forced administrative actions, and lateral compromise of the WordPress site.

Affected Products

Deetronix Booking Ultra Pro plugin for WordPress
All versions from initial release through 1.1.21
WordPress installations with the vulnerable plugin activated

Discovery Timeline

2025-09-03 - CVE-2025-58633 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-58633

Vulnerability Analysis

The Booking Ultra Pro plugin fails to properly sanitize and encode user-controlled input before rendering it back into HTML output. An attacker with at least low-privileged access, such as a subscriber or contributor account, can submit crafted input containing JavaScript payloads. The plugin stores this input server-side and serves it to other users on subsequent page loads. Because the payload persists in the database, every visitor rendering the affected view triggers the injected script.

The attack requires user interaction, as a victim must load a page that renders the stored payload. The scope changes from the vulnerable plugin context to the containing WordPress site, meaning the injected script executes with the privileges of the viewing user's session. When an administrator views the tainted content, the attacker gains the ability to perform any administrative action available through the WordPress interface, including plugin installation, user creation, and content modification.

Root Cause

The root cause is missing output encoding when rendering booking-related fields that accept user input. WordPress provides sanitization helpers such as esc_html(), esc_attr(), and wp_kses(), but the affected code paths in Booking Ultra Pro through version 1.1.21 do not consistently apply them before echoing values into the HTML response.

Attack Vector

Exploitation occurs over the network through the WordPress web interface. An attacker authenticates with a low-privilege account and submits booking data or profile fields containing an HTML or JavaScript payload. The payload is stored persistently. When an administrator or other authenticated user views the affected booking record, the browser parses and executes the injected script in the site's origin context. See the Patchstack XSS Vulnerability Report for advisory details.

Detection Methods for CVE-2025-58633

Indicators of Compromise

Booking records or plugin-managed fields containing <script>, onerror=, onload=, or javascript: strings
Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after viewing booking pages
New administrator accounts, plugin installations, or theme edits made without authorized change records
Session cookies appearing in web server referrer logs or third-party analytics

Detection Strategies

Query the WordPress database for booking and metadata rows containing HTML event handlers or <script substrings
Enable Content Security Policy (CSP) reporting endpoints and monitor for inline script violations on admin pages
Review WordPress audit logs for privilege changes, plugin uploads, and option modifications correlated to admin sessions viewing booking content

Monitoring Recommendations

Monitor authenticated POST requests to Booking Ultra Pro endpoints for payloads containing HTML tags or JavaScript syntax
Alert on administrative actions performed within seconds of loading a booking view, which suggests scripted automation via injected code
Track file integrity for wp-content/plugins/ and wp-content/themes/ to detect post-exploitation persistence

How to Mitigate CVE-2025-58633

Immediate Actions Required

Update Booking Ultra Pro to a version later than 1.1.21 as soon as the vendor releases a patched build
Audit all booking records and plugin-managed content for stored payloads and remove tainted entries
Rotate credentials and invalidate active sessions for any administrator who viewed suspicious booking data
Restrict registration of low-privilege accounts on public-facing WordPress sites until remediated

Patch Information

At the time of publication, the Patchstack advisory identifies all versions through 1.1.21 as vulnerable. Administrators should monitor the WordPress plugin repository for a fixed release from Deetronix and apply it immediately upon availability.

Workarounds

Deactivate and remove the Booking Ultra Pro plugin until a patched version is installed
Deploy a web application firewall (WAF) rule that blocks HTML tags and JavaScript syntax in requests to plugin endpoints
Enforce a strict Content Security Policy that disallows inline scripts on WordPress admin pages
Restrict WordPress user registration and require administrator approval for new accounts

bash

# Configuration example: disable the vulnerable plugin via WP-CLI
wp plugin deactivate booking-ultra-pro
wp plugin delete booking-ultra-pro

# Example WAF rule (ModSecurity) blocking script tags on plugin endpoints
SecRule REQUEST_URI "@contains /wp-admin/admin-ajax.php" \
  "chain,deny,status:403,id:1005863,msg:'Booking Ultra Pro XSS attempt'"
  SecRule ARGS "@rx (?i)(<script|onerror=|onload=|javascript:)" "t:none"