Server-Side Request Forgery (SSRF) in Open WebUI - CVE-2026-54008
Published: June 30, 2026
Vulnerability identifier: #VU135944
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-54008
CWE-ID: CWE-918
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 disclose sensitive information from internal network resources.
The vulnerability exists due to server-side request forgery (SSRF) in _process_picture_url in backend/open_webui/utils/oauth.py when processing an OAuth picture URL that redirects to an internal address. A remote user can supply a public URL in the OAuth picture claim that returns a redirect to an internal resource to disclose sensitive information from internal network resources.
Exploitation requires OAuth signup or picture update on login to be enabled, and the attacker-controlled response body is base64-encoded into the user's profile_image_url field where it can be read back.
How to mitigate CVE-2026-54008
Install security update from vendor's website.