CVE-2026-59714Public exploitNetwork attack vector

Authenticated cross-channel message overwrite via unchecked message ID

Published Aug 13, 2026 · Updated Aug 13, 2026

Missing authorization in Open WebUI 0.9.5 through 0.9.6 allows remote authenticated users to overwrite cross-channel messages. The chat completion channel path passes caller-supplied message IDs to _make_channel_emitter, which updates the Messages table by primary key without verifying channel membership or matching the message to that channel. Any authenticated account with a target message ID can replace content in inaccessible private or direct-message channels while retaining the original author attribution.

CVSS severity7.1
High
EPSS probability0.34%
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 0.9.5 through 0.9.6 allows remote authenticated users to overwrite cross-channel messages. The chat completion channel path passes caller-supplied message IDs to _make_channel_emitter, which updates the Messages table by primary key without verifying channel membership or matching the message to that channel. Any authenticated account with a target message ID can replace content in inaccessible private or direct-message channels while retaining the original author attribution.

The record

CVE
CVE-2026-59714
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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, < 0.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=>= 0.9.5, < 0.10.0

Published CVSS scores

7.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

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-862Missing Authorization
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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