Missing Authorization in Open WebUI - #VU130178
Published: May 5, 2026
Vulnerability identifier: #VU130178
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open WebUI
Affected software:
Open WebUI
Open WebUI
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service and disclose sensitive information.
The vulnerability exists due to missing authorization in the /responses endpoint when handling POST requests to /api/openai/responses with an arbitrary model ID. A remote user can send a specially crafted request to cause a denial of service and disclose sensitive information.
The endpoint forwards requests directly to upstream LLM providers without enforcing per-model access control, but it does not expose workspace-specific model configurations or related confidential data through this vector.
Remediation
Install security update from vendor's website.