CVE-2025-63307
📋 TL;DR
CVE-2025-63307 is a Cross-Site Scripting (XSS) vulnerability in alexusmai/laravel-file-manager version 3.3.1 that allows attackers to upload malicious HTML or SVG files and have them served inline without proper sanitization. This enables execution of arbitrary JavaScript in victims' browsers when they view the uploaded files. Anyone using the vulnerable version of this Laravel file manager package is affected.
💻 Affected Systems
- alexusmai/laravel-file-manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, deface websites, or redirect users to malicious sites, potentially leading to full account compromise.
Likely Case
Attackers inject malicious scripts to steal user sessions or credentials, perform unauthorized actions, or deface the application.
If Mitigated
With proper content security policies and file type restrictions, impact is limited to isolated script execution without access to sensitive data.
🎯 Exploit Status
Exploitation requires file upload privileges but is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.2 or later
Vendor Advisory: https://github.com/alexusmai/laravel-file-manager
Restart Required: No
Instructions:
1. Update composer.json to require "alexusmai/laravel-file-manager": "^3.3.2"
2. Run composer update
3. Clear Laravel cache: php artisan cache:clear
4. Verify the update with composer show alexusmai/laravel-file-manager
🔧 Temporary Workarounds
Restrict file upload types
allConfigure the file manager to block HTML and SVG file uploads
Edit config/file-manager.php to add 'html', 'svg' to disallowed file types array
Force download instead of inline display
allConfigure files to download rather than display inline in browser
Set 'inline' => false in file manager configuration for HTML/SVG MIME types
🧯 If You Can't Patch
- Implement strict Content Security Policy headers to block inline script execution
- Deploy WAF rules to detect and block malicious file uploads containing script tags
🔍 How to Verify
Check if Vulnerable:
Check if using version 3.3.1: composer show alexusmai/laravel-file-manager | grep versionCheck Version:
composer show alexusmai/laravel-file-manager | grep versionVerify Fix Applied:
Confirm version is 3.3.2 or higher: composer show alexusmai/laravel-file-manager📡 Detection & Monitoring
Log Indicators:
- Unusual HTML/SVG file uploads
- Multiple file rename operations to .html/.svg extensions
- Requests to uploaded files with suspicious parameters
Network Indicators:
- Unexpected JavaScript execution in file preview endpoints
- External script loads from file upload domains
SIEM Query:
source="web_logs" AND (uri="*.html" OR uri="*.svg") AND (user_agent CONTAINS "script" OR referrer CONTAINS "javascript")