HighVulnerability

CVE-2026-45401: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, the…

Source: NVD(opens in a new tab)
Identifier: CVE-2026-45401
Published: May 15, 2026
Record updated: October 9, 2026

Affected: open-webui <= 0.9.4
Fixed in: 0.9.5
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.3%

Summary

CVE-2026-45401 affects Open WebUI versions prior to 0.9.5. The validate_url() function in backend/open_webui/retrieval/web/utils.py checks only the initial URL, and the downstream HTTP clients follow 3xx redirects without re-validating the target against the private-IP and metadata-IP block list. Any authenticated user can submit a public URL that redirects to an internal address and read the internal response body through /api/v1/retrieval/process/web and other routes that call these helpers.

Mitigation

Fixed in 0.9.5.

Details

Scores and exploitation

CVSS score: 8.5(high)
Patch available: Yes
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Attack vector: network
Attack complexity: low
Privileges required: low
User interaction: none
EPSS: 0.3%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 14, 2026.
Disclosure date: May 15, 2026

Weaknesses and techniques

Weakness (CWE): CWE-918
Attack pattern (CAPEC): CAPEC-664

Affected

Packages: open-webui@<= 0.9.4 (fixed: 0.9.5)

Classification

Attack type: Other
Attack sophistication: Moderate
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.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-45401

First tracked: May 15, 2026 at 08:12 PM ET, from NVD/CVE Database

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

Classifier confidence: 90% (self-assessed)

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

open-webuiPyPILLM dependency since 2024-05-20

Summary

Mitigation

Affected packages in the Exposure Registry

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