CVE-2026-54009Public exploitNetwork attack vector

Cross-user file disclosure via unchecked image identifier

Published Jun 23, 2026 · Updated Jun 23, 2026

Authorization bypass in Open WebUI before 0.9.6 allows remote authenticated users to read other users' files through chat completions. The convert_url_images_to_base64 path treats a non-HTTP image_url.url as a global file ID and calls Files.get_file_by_id without an ownership check. Exploitation requires a disclosed file ID and a compatible model, which returns the victim file's content in its response.

CVSS severity6.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Open WebUI before 0.9.6 allows remote authenticated users to read other users' files through chat completions. The convert_url_images_to_base64 path treats a non-HTTP image_url.url as a global file ID and calls Files.get_file_by_id without an ownership check. Exploitation requires a disclosed file ID and a compatible model, which returns the victim file's content in its response.

The record

CVE
CVE-2026-54009
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-639, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 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=< 0.9.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=< 0.9.6

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

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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