CVE-2025-61074
📋 TL;DR
A stored cross-site scripting (XSS) vulnerability in the adata Software GmbH Mitarbeiter Portal bulletin board allows authenticated attackers to inject malicious JavaScript into bulletin board messages. When other users view these messages, their browsers execute the attacker's code, potentially compromising their sessions or stealing sensitive data. This affects authenticated users of the Mitarbeiter Portal version 2.15.2.0.
💻 Affected Systems
- adata Software GmbH Mitarbeiter Portal
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as other users, redirect to malicious sites, or install malware on victim browsers.
Likely Case
Session hijacking, credential theft, or defacement of the bulletin board content.
If Mitigated
Limited impact if proper input validation and output encoding are implemented.
🎯 Exploit Status
Exploitation involves simple manipulation of the 'Inhalt' parameter in CreateNachricht or EditNachricht requests. Public details available in the reference link.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.adata.de/mitarbeiter-portal/
Restart Required: No
Instructions:
Check vendor website for security updates. If unavailable, implement input validation and output encoding in the SchwarzeBrett module.
🔧 Temporary Workarounds
Implement Content Security Policy (CSP)
allAdd a CSP header to restrict script execution to trusted sources only.
Add 'Content-Security-Policy: script-src 'self';' to HTTP headers
Disable Bulletin Board Module
allTemporarily disable the SchwarzeBrett module if not essential.
Disable via application configuration or remove module access
🧯 If You Can't Patch
- Implement strict input validation on the 'Inhalt' parameter to reject HTML/JavaScript content.
- Apply output encoding to all user-generated content displayed in the bulletin board.
🔍 How to Verify
Check if Vulnerable:
Test by submitting a bulletin board message with a simple XSS payload like <script>alert('test')</script> and check if it executes when viewed.Check Version:
Check application version in admin panel or configuration files; specific command depends on deployment.Verify Fix Applied:
After fixes, repeat the test to ensure the payload is sanitized and does not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /SchwarzeBrett/Nachrichten/CreateNachricht or /SchwarzeBrett/Nachrichten/EditNachricht/ with script tags in parameters
Network Indicators:
- HTTP traffic containing JavaScript in 'Inhalt' parameter values
SIEM Query:
source="web_logs" AND (url="/SchwarzeBrett/Nachrichten/CreateNachricht" OR url="/SchwarzeBrett/Nachrichten/EditNachricht/") AND (param="Inhalt" AND value MATCHES "<script.*>")