CVE-2025-30223
📋 TL;DR
A Cross-Site Scripting (XSS) vulnerability in Beego's RenderForm() function allows attackers to inject malicious JavaScript that executes in victims' browsers. This affects any application using Beego versions before 2.3.6 with user-provided data in RenderForm(). Developers who assumed automatic HTML escaping are particularly vulnerable.
💻 Affected Systems
- Beego web framework
📦 What is this software?
Beego by Beego
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, session hijacking, credential theft, and unauthorized administrative access leading to data breach or system compromise.
Likely Case
Session hijacking and credential theft from authenticated users, potentially leading to unauthorized access to sensitive application data.
If Mitigated
Limited impact with proper input validation and output encoding controls in place, though still potentially exposing some user data.
🎯 Exploit Status
XSS vulnerabilities are commonly exploited and require minimal technical skill. The vulnerability is in a high-level function that developers would expect to handle escaping automatically.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.6
Vendor Advisory: https://github.com/beego/beego/security/advisories/GHSA-2j42-h78h-q4fg
Restart Required: Yes
Instructions:
1. Update Beego dependency to version 2.3.6 or later. 2. Run 'go get github.com/beego/beego/v2@v2.3.6'. 3. Rebuild and redeploy your application. 4. Restart the application server.
🔧 Temporary Workarounds
Manual HTML escaping
allManually escape all user-controlled data before passing to RenderForm() function
Use html.EscapeString() or template.HTMLEscapeString() on all user inputs
Disable RenderForm() usage
allReplace RenderForm() calls with manually constructed forms with proper escaping
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to mitigate script execution
- Deploy a Web Application Firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check if your application uses RenderForm() with user-controlled data and verify Beego version is below 2.3.6Check Version:
go list -m github.com/beego/beego/v2Verify Fix Applied:
Confirm Beego version is 2.3.6 or higher and test form rendering with malicious input to ensure proper escaping📡 Detection & Monitoring
Log Indicators:
- Unusual form submissions with script tags or JavaScript code
- Multiple failed login attempts from same session
Network Indicators:
- HTTP requests containing script tags in form parameters
- Unexpected JavaScript execution in browser logs
SIEM Query:
source="web_logs" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=") AND uri_path="*form*"