CVE-2026-54007Public exploitNetwork attack vector

Forced model execution via cross-origin postMessage handling

Published Jun 23, 2026 · Updated Jun 23, 2026

Origin validation error in Open WebUI before 0.9.6 allows remote attackers to force model or tool actions through an authenticated browser. The Chat.svelte window message listener accepts cross-origin input:prompt and action:submit events, writes attacker text into the prompt, and invokes submitPrompt(). A victim must be signed in and interact with an attacker-controlled page, after which requests run with the victim's model and tool privileges.

CVSS severity7.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in Open WebUI before 0.9.6 allows remote attackers to force model or tool actions through an authenticated browser. The Chat.svelte window message listener accepts cross-origin input:prompt and action:submit events, writes attacker text into the prompt, and invokes submitPrompt(). A victim must be signed in and interact with an attacker-controlled page, after which requests run with the victim's model and tool privileges.

The record

CVE
CVE-2026-54007
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-346, T1204.001
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

Open WebUI · Open WebUIversion=< 0.9.6

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
7.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-346Origin Validation Error
T1204.001Malicious Link

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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