CVE-2026-109296

MEDIUM 4.3

Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639
Vendor	open-webui
Product	open-webui
Published	Oct 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

open-webui / open-webui

0 < 0.11.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/open-webui/open-webui/security/advisories/GHSA-hm62-64q2-6gxw vulncheck.com: https://www.vulncheck.com/advisories/open-webui-before-0.11.4-missing-authorization-via-backend-index-on-model-routes

Credits

🔍 ahkarl13 Classic298