CVE-2026-70487Network attack vectorHinoki check available

Cross-user file disclosure via unchecked inline metadata

Published Aug 4, 2026 · Updated Aug 4, 2026

Missing authorization in Open WebUI 0.8.8 through 0.10.2 allows remote authenticated users to read indexed chunks from other users' files. The chat completion, completed, and action paths trusted client-supplied inline model knowledge metadata without filtering referenced files through the caller's read access. Exploitation requires any authenticated account, a known target file UUID, a session id, native function calling, and enabled builtin tools; it discloses indexed chunks but cannot modify or delete data.

CVSS severity5.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authorization in Open WebUI 0.8.8 through 0.10.2 allows remote authenticated users to read indexed chunks from other users' files. The chat completion, completed, and action paths trusted client-supplied inline model knowledge metadata without filtering referenced files through the caller's read access. Exploitation requires any authenticated account, a known target file UUID, a session id, native function calling, and enabled builtin tools; it discloses indexed chunks but cannot modify or delete data.

The record

CVE
CVE-2026-70487
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-862, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 0.8.8, < 0.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=>= 0.8.8, < 0.11.0

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo