Server-Side Request Forgery (SSRF) in Open WebUI - CVE-2026-45338
Published: May 11, 2026
Vulnerability identifier: #VU130939
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2026-45338
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 resources.
The vulnerability exists due to server-side request forgery (SSRF) in _process_picture_url() in backend/open_webui/utils/oauth.py when processing OAuth picture claims. A remote user can supply a crafted picture URL to disclose sensitive information from internal resources.
Exploitation requires OAuth to be configured with ENABLE_OAUTH_SIGNUP=true or OAUTH_UPDATE_PICTURE_ON_LOGIN=true.
Affected software
Open WebUI
How to mitigate CVE-2026-45338
Install security update from vendor's website.
Open WebUI - update to 0.9.0