User-Controllable Hostname Vulnerability in Open WebUI by Open WebUI
CVE-2026-87996

7.7HIGH

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
9 September 2026

What is CVE-2026-87996?

The Open WebUI platform has a vulnerability in the SafePlaywrightURLLoader component where it fails to properly validate user-controlled hostnames. This issue allows authenticated users with access to authoritative DNS to manipulate hostname validation, potentially leading to the browser resolving to internal addresses instead of public ones. As a result, sensitive information from internal services or cloud metadata may be exposed through web searches or URL ingestion. The vulnerability has been addressed in version 0.11.1.

Affected Version(s)

open-webui >= 0.9.6, < 0.11.1

References

https://github.com/open-webui/open-webui/security/advisor...
x_refsource_CONFIRM
https://github.com/open-webui/open-webui/pull/28634
x_refsource_MISC
https://github.com/open-webui/open-webui/commit/27402ff21...
x_refsource_MISC

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.