Server-Side Request Forgery Vulnerability in Open WebUI by Open WebUI
CVE-2026-56399

5.3MEDIUM

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
30 June 2026

What is CVE-2026-56399?

A vulnerability exists in Open WebUI versions prior to 0.6.27 that allows an authenticated user to exploit the server-side request forgery (SSRF) protections. By manipulating URL parameters in the /api/v1/retrieval/process/web endpoint, an attacker could potentially redirect internal requests and access sensitive resources. This may lead to unauthorized command execution via instance secrets, compromising server integrity and reliability.

Affected Version(s)

open-webui 0 < 0.6.27

open-webui 0.6.27

References

https://github.com/open-webui/open-webui/security/advisor...
vendor-advisory
https://github.com/open-webui/open-webui/commit/02238d311...
patch
https://www.vulncheck.com/advisories/open-webui-server-si...
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mosstrow
.