CVE-2025-51962
📋 TL;DR
A HTML injection vulnerability in MicroStudio's comment section allows attackers to inject malicious scripts or HTML via the text parameter. This affects all users of MicroStudio 24.01.29 who can access project pages, potentially leading to client-side attacks against other users viewing comments.
💻 Affected Systems
- MicroStudio
📦 What is this software?
Microstudio by Microstudio
⚠️ Risk & Real-World Impact
Worst Case
Attackers could execute arbitrary JavaScript in victims' browsers, leading to session hijacking, credential theft, or complete account compromise through cross-site scripting attacks.
Likely Case
Attackers inject malicious HTML/scripts that deface pages, redirect users to phishing sites, or steal session cookies from authenticated users.
If Mitigated
With proper input validation and output encoding, injected content would be displayed as plain text rather than executed as code.
🎯 Exploit Status
Exploitation requires ability to post comments, which typically requires authentication. The vulnerability is well-documented in public repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check for official patches from MicroStudio developers
2. Apply input validation and output encoding to the add_project_comment function
3. Sanitize all user-controlled text parameters before processing
🔧 Temporary Workarounds
Disable comment functionality
allTemporarily disable the project comment feature to prevent exploitation
Modify application configuration to disable comment posting
Implement WAF rules
allAdd web application firewall rules to block HTML/script injection patterns
Add WAF rules to detect and block <script>, javascript:, and other HTML injection patterns
🧯 If You Can't Patch
- Implement strict input validation on the text parameter to reject HTML tags and JavaScript
- Enable Content Security Policy (CSP) headers to restrict script execution
🔍 How to Verify
Check if Vulnerable:
Test by posting a comment containing HTML tags like <script>alert('test')</script> or <img src=x onerror=alert(1)> and check if they executeCheck Version:
Check MicroStudio version in application settings or about pageVerify Fix Applied:
Attempt the same test after fixes; HTML should display as plain text rather than executing📡 Detection & Monitoring
Log Indicators:
- Unusual comment content containing script tags, JavaScript code, or HTML entities
- Multiple comment submissions from single user with suspicious patterns
Network Indicators:
- HTTP POST requests to add_project_comment with encoded HTML/script content
- Unusual outbound connections from client browsers after viewing comments
SIEM Query:
source="web_logs" AND (uri="/add_project_comment" OR uri="*comment*") AND (content="<script>" OR content="javascript:" OR content="onerror=" OR content="onload=")