Server-Side Request Forgery (SSRF) in Open WebUI - CVE-2026-56399
Published: May 5, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU130179
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2026-56399
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to access internal services and disclose sensitive information.
The vulnerability exists due to server-side request forgery (SSRF) in /api/v1/retrieval/process/web when processing user-supplied URLs that follow location redirects. A remote user can supply a crafted URL that redirects to an internal destination to access internal services and disclose sensitive information.
Direct internal fetches are blocked, but the protection can be bypassed through a redirect response.
Affected software
Open WebUI
How to mitigate CVE-2026-56399
Install security update from vendor's website.
Open WebUI - update to 0.6.27