CVE-2026-109296
Received Received - Intake

Open WebUI Missing Authorization in Model Provider Backends

Publication date: 2026-10-12

Last updated on: 2026-10-12

Assigner: VulnCheck

Description
Open WebUI before 0.11.4 contains a missing authorization vulnerability that allows authenticated users to reach disabled model provider backends by supplying an explicit backend index. Attackers can pass the index as a path segment or query parameter on Ollama and OpenAI-compatible listing routes to trigger requests carrying configured API keys, read version strings, and enumerate connections.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-12
Last Modified
2026-10-12
Generated
2026-10-12
AI Q&A
2026-10-12
EPSS Evaluated
N/A
NVD
CVE-2026-109296
EUVD
EUVD-2026-97598

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
open-webui open-webui 0

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

Open WebUI before version 0.11.4 has a missing authorization vulnerability where authenticated users can access disabled model provider backends by providing an explicit backend index. This is done by passing the index in API routes compatible with Ollama and OpenAI, allowing attackers to trigger requests with configured API keys, read version strings, and enumerate connections.

Detection Guidance

Check Open WebUI version with: curl -s http://<target>/api/version. If version is below 0.11.4, the system is vulnerable. Inspect API routes for disabled backend access by testing paths like /api/models?backend_index=<index> or /api/versions?backend_index=<index>.

Impact Analysis

Authenticated users could interact with disabled backends, potentially sending requests that include API keys, reading version strings, and enumerating connections. While the API key itself is not exposed, version strings are returned, and in some cases, users might even send inference requests to disabled backends.

Mitigation Strategies

Upgrade Open WebUI to version 0.11.4 or later immediately. Review and restrict user roles to prevent unauthorized access to disabled backends. Monitor API routes for suspicious backend index queries.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-109296. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart