Server-Side Request Forgery (SSRF) in Open WebUI - CVE-2026-54018
Published: June 30, 2026
Vulnerability identifier: #VU135952
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-54018
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 access internal services and disclose sensitive information.
The vulnerability exists due to improper control of server-side request forgery in SafePlaywrightURLLoader validate_url and Playwright page.goto when following HTTP redirects. A remote user can supply a benign-looking URL that redirects to an internal address to access internal services and disclose sensitive information.
Only the Playwright-based web loader is affected, and the issue can be triggered even when ENABLE_RAG_LOCAL_WEB_FETCH is set to false.
How to mitigate CVE-2026-54018
Install security update from vendor's website.