Missing Authorization in Open WebUI - #VU140759
Published: August 3, 2026
Vulnerability identifier: #VU140759
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper access control in the chat-completions endpoint when handling chat-completion requests with a client-supplied image-generation feature flag. A remote user can send a specially crafted chat-completion request to cause a denial of service.
Image generation must be enabled and a provider must be configured. On 0.10.0 and later, exploitation requires setting params.function_calling to legacy; deployments using native function calling are unaffected.
Affected software
Open WebUI
Remediation
Install security update from vendor's website.
Open WebUI - update to 0.11.0