CVE-2026-87999

Undergoing Analysis Undergoing Analysis - In Progress

Server-Side Request Forgery in Open WebUI

Publication date: 2026-09-09

Last updated on: 2026-09-10

Assigner: GitHub, Inc.

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.1, POST /api/v1/retrieval/process/web and POST /api/v1/retrieval/process/web/search in backend/open_webui/retrieval/web/utils.py treated Python's globally routable address classification as proof that a destination was external. An authenticated user could make an Azure-hosted instance fetch and return content from 168.63.129.16, the Azure platform channel, as well as other reserved ranges that the standard classification did not reject. This issue is fixed in version 0.11.1.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-09

Last Modified

2026-09-10

Generated

2026-09-30

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-87999

EUVD

EUVD-2026-75184

Affected Vendors & Products

Vendor	Product	Version / Range
open_webui	open_webui	0.11.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

Open WebUI before version 0.11.1 had a flaw in its retrieval process where it incorrectly treated certain internal IP addresses as external. This allowed authenticated users to trick the system into fetching content from reserved IP ranges like Azure's platform channel (168.63.129.16).

Detection Guidance

Check Open WebUI version. If it is below 0.11.1, the system is vulnerable. Commands: docker ps (for containerized instances) or pip show open-webui (for pip installations).

Impact Analysis

An attacker with access could retrieve sensitive internal data from restricted networks. This may lead to unauthorized information disclosure or further exploitation of internal systems if combined with other vulnerabilities.

Compliance Impact

This vulnerability could violate data protection requirements by enabling unauthorized access to internal resources. GDPR and HIPAA require strict access controls and data protection measures, which this flaw undermines.

Mitigation Strategies

Update Open WebUI to version 0.11.1 or later to address the issue. Monitor network traffic for unauthorized requests to reserved IP ranges like 168.63.129.16.

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