Server-Side Request Forgery (SSRF) in Open WebUI - CVE-2026-45400
Published: May 11, 2026
Vulnerability identifier: #VU130957
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2026-45400
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform server-side request forgery.
The vulnerability exists due to inconsistent URL parsing in validate_url when validating and fetching user-supplied URLs. A remote user can supply a specially crafted URL to perform server-side request forgery.
The issue is caused by a parsing difference between urllib.parse.urlparse and the requests library, which can make validation treat the destination as a public host while the actual request is sent to an internal host.
Affected software
Open WebUI
How to mitigate CVE-2026-45400
Install security update from vendor's website.
Open WebUI - update to 0.9.5