CVE-2025-25957
📋 TL;DR
This Cross-Site Scripting (XSS) vulnerability in Xunruicms allows attackers to inject malicious scripts that execute in users' browsers. It affects Xunruicms versions 4.6.3 and earlier, potentially enabling privilege escalation when authenticated users view crafted content. The vulnerability requires user interaction but can lead to session hijacking or administrative access.
💻 Affected Systems
- Xunruicms
📦 What is this software?
Xunruicms by Xunruicms
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains administrative privileges, takes full control of the CMS, and compromises the entire website including data theft, defacement, or malware distribution.
Likely Case
Attacker steals session cookies or authentication tokens from logged-in users, leading to account takeover and limited privilege escalation within the CMS.
If Mitigated
Script execution is blocked by Content Security Policy (CSP) headers, input validation prevents payload delivery, or users have limited privileges that restrict damage.
🎯 Exploit Status
Exploit details are publicly available in GitHub issue #5; requires attacker to craft malicious script and trick authenticated user into executing it.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.6.4 or later
Vendor Advisory: https://github.com/dayrui/xunruicms/issues/5
Restart Required: No
Instructions:
1. Backup your current installation. 2. Download the latest version from the official repository. 3. Replace affected files with patched versions. 4. Clear cache and verify functionality.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources and prevent inline scripts.
Add to web server config: Content-Security-Policy: default-src 'self'; script-src 'self'
Input Sanitization Filter
allApply HTML encoding to user inputs before rendering in web pages.
Implement output encoding in PHP: htmlspecialchars($input, ENT_QUOTES, 'UTF-8')
🧯 If You Can't Patch
- Restrict user permissions to minimize privilege escalation impact
- Implement Web Application Firewall (WAF) rules to block XSS payload patterns
🔍 How to Verify
Check if Vulnerable:
Check if Xunruicms version is 4.6.3 or earlier by examining version files or admin panel.Check Version:
Check /dayrui/Config/Version.php or admin dashboard for version numberVerify Fix Applied:
Test input fields with basic XSS payloads like <script>alert('test')</script> and verify they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual script tags in input fields
- Multiple failed login attempts followed by successful admin access
Network Indicators:
- HTTP requests containing script tags in parameters
- Unexpected outbound connections after user visits crafted pages
SIEM Query:
source="web_logs" AND (uri="*<script*" OR params="*javascript:*")