CVE-2023-54363: Joomla Solidres XSS Vulnerability

CVE-2023-54363 Overview

CVE-2023-54363 is a reflected cross-site scripting (XSS) vulnerability affecting Joomla Solidres version 2.13.3, a popular booking and reservations extension for the Joomla content management system. The vulnerability allows unauthenticated attackers to inject malicious JavaScript code by manipulating multiple GET parameters, enabling potential session hijacking, credential theft, and site content manipulation.

Critical Impact

Unauthenticated attackers can craft malicious URLs to steal session tokens, login credentials, or manipulate site content when victims click the crafted links.

Affected Products

• Joomla Solidres 2.13.3
• Joomla CMS installations with Solidres booking extension

Discovery Timeline

• 2026-04-09 - CVE CVE-2023-54363 published to NVD
• 2026-04-09 - Last updated in NVD database

Technical Details for CVE-2023-54363

Vulnerability Analysis

This reflected XSS vulnerability exists due to insufficient input validation and output encoding in the Solidres component for Joomla. The extension fails to properly sanitize user-supplied input across multiple GET parameters before reflecting them back in HTTP responses. The vulnerable parameters include show, reviews, type_id, distance, facilities, categories, prices, location, and Itemid.

When a user clicks a malicious link containing JavaScript payloads in these parameters, the malicious script executes in the context of the victim's browser session. This allows attackers to perform actions on behalf of authenticated users, including administrators, without their consent.

Root Cause

The root cause of this vulnerability is improper input validation (CWE-79: Improper Neutralization of Input During Web Page Generation). The Solidres extension directly reflects GET parameter values in the rendered HTML output without proper sanitization or encoding. This allows attackers to break out of the intended data context and inject arbitrary HTML or JavaScript code that executes in the victim's browser.

Attack Vector

The attack is network-based and requires user interaction. An attacker must craft a malicious URL containing JavaScript payloads within one or more of the vulnerable GET parameters and convince a victim to click the link. This is typically accomplished through phishing emails, malicious advertisements, or social engineering tactics.

The vulnerable GET parameters that can be exploited include:

• show - Controls display options
• reviews - Filter for reviews
• type_id - Property type identifier
• distance - Search distance parameter
• facilities - Facilities filter
• categories - Category filter
• prices - Price range filter
• location - Location search parameter
• Itemid - Joomla menu item identifier

When a victim visits a crafted URL, the malicious script executes in their browser context, potentially allowing the attacker to steal session cookies, capture keystrokes, redirect users to phishing sites, or perform administrative actions if the victim has elevated privileges.

Detection Methods for CVE-2023-54363

Indicators of Compromise

• Suspicious HTTP requests to Solidres component URLs containing encoded JavaScript payloads in GET parameters
• Web server logs showing requests with <script> tags or JavaScript event handlers in query string parameters
• User reports of unexpected browser behavior or redirects when accessing booking pages
• Session tokens appearing in referer headers to external domains

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block XSS payloads in GET parameters
• Monitor access logs for requests containing common XSS patterns such as <script>, javascript:, onerror=, and onload= in query strings
• Deploy browser-based XSS detection through Content Security Policy (CSP) violation reporting
• Utilize SIEM correlation rules to identify patterns of malicious URL distribution targeting your Joomla installation

Monitoring Recommendations

• Enable verbose logging for the Joomla Solidres component and review logs for anomalous parameter values
• Configure real-time alerting for WAF XSS detection events targeting Solidres URLs
• Monitor for unusual patterns of outbound connections from user browsers that may indicate successful XSS exploitation
• Track CSP violation reports for inline script execution attempts on pages utilizing Solidres

How to Mitigate CVE-2023-54363

Immediate Actions Required

• Review the VulnCheck Advisory for the latest security guidance
• Implement a Web Application Firewall (WAF) with XSS filtering capabilities as an interim measure
• Apply strict Content Security Policy (CSP) headers to prevent inline script execution
• Consider temporarily disabling the Solidres component if not critical to operations until a patch is available

Patch Information

Check the Solidres Homepage and Joomla Extension Directory for updated versions that address this vulnerability. Administrators should regularly monitor these sources for security updates. Additional technical details about the exploit can be found in Exploit-DB #51638.

Workarounds

• Deploy a WAF rule to sanitize or block requests containing potentially malicious characters in the affected GET parameters
• Implement server-side input validation to whitelist acceptable values for parameters like type_id, distance, and Itemid
• Add output encoding at the application level using Joomla's built-in htmlspecialchars() or equivalent functions
• Configure Content Security Policy headers with script-src 'self' to prevent execution of injected inline scripts

# Example Apache mod_headers CSP configuration
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>