CVE-2026-0767
📋 TL;DR
Open WebUI transmits credentials in plaintext, allowing network-adjacent attackers to intercept authentication data without authentication. This affects all Open WebUI installations using the vulnerable endpoint. Attackers can capture credentials and potentially gain unauthorized access.
💻 Affected Systems
- Open WebUI
📦 What is this software?
Open Webui by Openwebui
⚠️ Risk & Real-World Impact
Worst Case
Attackers capture administrative credentials, gain full system control, and pivot to other systems in the network.
Likely Case
Attackers capture user credentials, access sensitive data, and perform unauthorized actions within the application.
If Mitigated
Credential exposure limited to internal network segments with proper segmentation and monitoring.
🎯 Exploit Status
Exploitation requires network sniffing capabilities but no authentication. Simple packet capture tools can intercept credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-26-033/
Restart Required: Yes
Instructions:
1. Check current Open WebUI version. 2. Update to patched version per vendor instructions. 3. Restart Open WebUI service. 4. Verify encryption is enabled for credential transmission.
🔧 Temporary Workarounds
Enable TLS/SSL encryption
allConfigure Open WebUI to use HTTPS/TLS for all communications
Configure SSL/TLS in Open WebUI configuration file
Network segmentation
allIsolate Open WebUI to trusted network segments only
Configure firewall rules to restrict access to Open WebUI
🧯 If You Can't Patch
- Implement network-level encryption (VPN, IPSec) for all Open WebUI traffic
- Deploy network monitoring and IDS/IPS to detect credential sniffing attempts
🔍 How to Verify
Check if Vulnerable:
Use network analyzer to check if credentials are transmitted in plaintext to Open WebUI endpointsCheck Version:
Check Open WebUI version in web interface or configurationVerify Fix Applied:
Verify credentials are encrypted (HTTPS/TLS) in network traffic after patch📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts from new IPs
- Unusual access patterns to credential endpoints
Network Indicators:
- Unencrypted HTTP traffic to authentication endpoints
- ARP spoofing or network sniffing activity
SIEM Query:
source="openwebui" AND (event="authentication" OR event="credential") AND protocol="HTTP"