MediumVulnerabilityLLM-specific

CVE-2026-109296: Open WebUI missing authorization lets users reach disabled model backends

Source: NVD(opens in a new tab)
Identifier: CVE-2026-109296
Published: October 12, 2026
Record updated: October 12, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.

Summary

Open WebUI before 0.11.4 has a missing authorization flaw that lets authenticated users reach model provider backends that are disabled. By supplying an explicit backend index as a path segment or query parameter on the Ollama and OpenAI-compatible listing routes, an attacker can trigger requests carrying configured API keys, read version strings, and enumerate connections.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 4.3(medium)
CVSS vector: 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
EPSS: Not scored. FIRST had not published an EPSS score for this CVE when it was last checked on October 12, 2026.
Disclosure date: October 12, 2026

Weaknesses and techniques

Weakness (CWE): CWE-639

Affected

Vendors: OpenAI

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: API
Impact: Confidentiality
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-109296

First tracked: October 12, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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