Authentication Bypass by Spoofing in Open WebUI - CVE-2026-59224
Published: July 3, 2026
Vulnerability identifier: #VU136848
CSH Severity: Medium
CVSS v4: 7.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59224
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to spoof another user's identity to access that user's terminal scope.
The vulnerability exists due to authentication bypass by spoofing in the terminal proxy in backend/open_webui/routers/terminals.py when forwarding terminal identity to the upstream terminal server or backend coordinator. A remote user can supply crafted terminal requests or a crafted session_id value to make the upstream resolve a spoofed user identity and access that user's terminal scope.
On the WebSocket path, exploitation can allow attaching to a live PTY when a valid active session ID is known, such as one exposed through a shared chat.
Affected software
Open WebUI
How to mitigate CVE-2026-59224
Install security update from vendor's website.
Open WebUI - update to 0.10.0