CVE-2022-4862
📋 TL;DR
This vulnerability allows authenticated users to inject HTML content that gets rendered in other users' browsers in M-Files Web, potentially enabling cross-site scripting attacks. It affects all M-Files Web installations before version 22.12.12140.3. The issue could lead to theft of sensitive user information.
💻 Affected Systems
- M-Files Web
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could steal session tokens, credentials, or other sensitive data from other authenticated users, potentially leading to account compromise and data exfiltration.
Likely Case
Authenticated users could craft malicious HTML content that steals session cookies or sensitive information from other users viewing that content.
If Mitigated
With proper input validation and output encoding, the risk is limited to authenticated users only, reducing the attack surface.
🎯 Exploit Status
Requires authenticated user access to exploit
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 22.12.12140.3
Vendor Advisory: https://empower.m-files.com/security-advisories/CVE-2022-4862
Restart Required: Yes
Instructions:
1. Download M-Files Web version 22.12.12140.3 or later from official M-Files sources. 2. Backup current installation. 3. Install the updated version following M-Files documentation. 4. Restart M-Files services.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation for user-provided HTML content
Content Security Policy
allImplement strict Content Security Policy headers to limit script execution
🧯 If You Can't Patch
- Restrict user permissions to limit who can create or modify HTML content
- Implement web application firewall rules to detect and block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check M-Files Web version in administration console or via M-Files APICheck Version:
Check M-Files Server administration console or use M-Files API endpoint for version informationVerify Fix Applied:
Verify version is 22.12.12140.3 or later and test HTML rendering functionality📡 Detection & Monitoring
Log Indicators:
- Unusual HTML content submissions
- Multiple failed HTML rendering attempts
- Suspicious user activity patterns
Network Indicators:
- Unexpected script tags in HTTP requests
- Suspicious content in POST requests to content endpoints
SIEM Query:
source="m-files" AND (event="content_submission" OR event="html_render") AND (content CONTAINS "<script>" OR content CONTAINS "javascript:")