CVE-2026-45395Public exploitNetwork attack vector

Authenticated code execution via unauthorized tool update

Published May 15, 2026 · Updated May 15, 2026

Missing authorization in Open WebUI before 0.9.5 allows remote authenticated users to execute arbitrary server-side code through tool updates. The update_tools_by_id handler accepts replacement Python content after checking only tool-level write access, then passes that content to exec() without workspace.tools authorization. A regular user account and a write grant on one existing tool are required; successful exploitation runs Python with the server process's privileges.

CVSS severity7.2
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Open WebUI before 0.9.5 allows remote authenticated users to execute arbitrary server-side code through tool updates. The update_tools_by_id handler accepts replacement Python content after checking only tool-level write access, then passes that content to exec() without workspace.tools authorization. A regular user account and a write grant on one existing tool are required; successful exploitation runs Python with the server process's privileges.

The record

CVE
CVE-2026-45395
Published
May 15, 2026
Updated
May 15, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-269, CWE-862, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 15, 2026CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=< 0.9.5

Published CVSS scores

7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-862Missing Authorization
T1059.006Command and Scripting Interpreter: Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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