CVE-2020-37111: 60CycleCMS XSS Vulnerability in news.php

CVE-2020-37111 Overview

CVE-2020-37111 is a Cross-Site Scripting (XSS) vulnerability in 60CycleCMS version 2.5.2. The vulnerability exists in news.php and allows attackers to inject malicious scripts through GET parameters. Specifically, attackers can craft malicious URLs containing XSS payloads targeting the etsu and ltsu parameters to execute arbitrary JavaScript code in victims' browsers when they visit the crafted links.

Critical Impact

Successful exploitation allows attackers to execute arbitrary scripts in the context of a victim's browser session, potentially leading to session hijacking, credential theft, defacement, or malicious redirects.

Affected Products

• 60CycleCMS version 2.5.2
• Potentially other versions of 60CycleCMS with similar code patterns

Discovery Timeline

• 2026-02-03 - CVE CVE-2020-37111 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2020-37111

Vulnerability Analysis

This Cross-Site Scripting vulnerability occurs due to improper input sanitization in the news.php file of 60CycleCMS 2.5.2. The application fails to adequately validate or encode user-supplied input from the etsu and ltsu GET parameters before including them in the rendered HTML output. This allows attackers to inject malicious JavaScript code that executes in the context of the victim's browser when they navigate to a specially crafted URL.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which is one of the most common web application security flaws. It is important to note that this vulnerability is specifically an XSS issue and does not involve SQL injection.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the news.php script. When processing the etsu and ltsu GET parameters, the application directly incorporates user input into the page output without proper sanitization or HTML entity encoding. This allows specially crafted input containing JavaScript code to be rendered as executable script rather than being treated as plain text.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker must craft a malicious URL containing JavaScript payloads in the etsu or ltsu parameters and convince a victim to click on the link. Common delivery methods include:

• Phishing emails containing the malicious link
• Social engineering through messaging platforms
• Posting the malicious link on forums or comment sections
• URL shorteners to obfuscate the malicious payload

When a victim clicks the link and the page loads, the injected script executes in their browser with the same privileges as the legitimate application, potentially allowing the attacker to steal session cookies, capture keystrokes, or perform actions on behalf of the user.

The vulnerability can be exploited by appending malicious JavaScript to the vulnerable parameters in the URL. Technical details and a proof-of-concept are available in Exploit-DB #48177. The VulnCheck Advisory on CycleCMS XSS provides additional technical analysis of this vulnerability.

Detection Methods for CVE-2020-37111

Indicators of Compromise

• Unusual URL patterns in web server logs containing script tags or JavaScript event handlers in the etsu or ltsu parameters
• Requests to news.php with encoded or obfuscated payloads such as %3Cscript%3E or javascript: strings
• User reports of unexpected browser behavior or redirects when accessing 60CycleCMS pages
• Anomalous session activity following visits to pages with suspicious URL parameters

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in GET parameters
• Configure log analysis tools to alert on requests containing HTML tags or JavaScript keywords in query strings
• Deploy Content Security Policy (CSP) headers with violation reporting to detect XSS execution attempts
• Use browser-based security tools and extensions to identify potential XSS injections during testing

Monitoring Recommendations

• Enable detailed logging for news.php requests and monitor for unusual parameter values
• Set up automated alerts for requests containing common XSS signatures like <script>, onerror=, onload=, or javascript:
• Regularly audit web server access logs for patterns indicating XSS exploitation attempts
• Monitor for unexpected changes in user sessions or authentication tokens that may indicate successful exploitation

How to Mitigate CVE-2020-37111

Immediate Actions Required

• Implement input validation on the etsu and ltsu parameters to allow only expected characters and formats
• Apply output encoding (HTML entity encoding) when rendering user-supplied data in HTML context
• Deploy Content Security Policy (CSP) headers to restrict script execution sources
• Consider temporarily disabling or restricting access to news.php if the functionality is not critical

Patch Information

No official vendor patch has been identified for this vulnerability at this time. Administrators should check the David VG Home Page and OpenSourceCMS 60CycleCMS Info for any updates or security advisories from the vendor.

In the absence of an official patch, organizations should implement the workarounds and mitigations described below, or consider migrating to a more actively maintained CMS solution.

Workarounds

• Manually patch news.php to sanitize the etsu and ltsu parameters using appropriate encoding functions such as htmlspecialchars() with ENT_QUOTES flag
• Implement server-side input validation to reject requests containing potentially malicious characters in vulnerable parameters
• Deploy a Web Application Firewall (WAF) with XSS protection rules in front of the application
• Restrict access to the application using network-level controls until a proper fix can be implemented

# Example Apache mod_rewrite rule to block common XSS patterns in query strings
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{QUERY_STRING} (<|%3C).*script.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} javascript: [NC]
RewriteRule .* - [F,L]