Server-Side Request Forgery (SSRF) in Open WebUI - #VU140751
Published: August 3, 2026
Vulnerability identifier: #VU140751
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information from internal services and cloud metadata endpoints.
The vulnerability exists due to server-side request forgery in URL fetching and address validation logic in backend/open_webui/retrieval/web/utils.py when processing user-supplied URLs containing NAT64-encoded IPv6 literals. A remote user can submit a specially crafted URL to disclose sensitive information from internal services and cloud metadata endpoints.
Exploitation requires an authenticated account and a deployment network that provides NAT64 translation for the 64:ff9b::/96 prefix.
Affected software
Open WebUI
Remediation
Install security update from vendor's website.
Open WebUI - update to 0.11.0