CVE-2026-87997Public exploitNetwork attack vector

Authenticated chat injection via unchecked folder identifier

Published Sep 9, 2026 · Updated Sep 9, 2026

Improper authorization in Open WebUI 0.10.0 through 0.11.0 allows remote authenticated users to inject chats into shared folders. The chat-completions handler copies a client-supplied folder_id into a new chat without applying the folder write-access check enforced by dedicated chat routes. Any account can exploit a known shared-folder identifier when folders are enabled, but the flaw neither reveals existing data nor modifies or deletes existing chats.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Open WebUI 0.10.0 through 0.11.0 allows remote authenticated users to inject chats into shared folders. The chat-completions handler copies a client-supplied folder_id into a new chat without applying the folder write-access check enforced by dedicated chat routes. Any account can exploit a known shared-folder identifier when folders are enabled, but the flaw neither reveals existing data nor modifies or deletes existing chats.

The record

CVE
CVE-2026-87997
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-862, CWE-639, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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=>= 0.10.0, < 0.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=>= 0.10.0, < 0.11.1

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

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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