CVE-2026-59214Public exploitNetwork attack vector

Server-side code execution via same-origin Pyodide requests

Published Jul 9, 2026 · Updated Jul 9, 2026

Stored XSS in Open WebUI before 0.10.0 allows remote authenticated users to execute server-side code through a shared chat payload. The same-origin Pyodide web worker exposes pyfetch, fetch, and XMLHttpRequest, which attach the victim's session cookie to attacker-chosen application API requests. Exploitation requires a low-privileged user to share the payload, a victim to click Run, Pyodide to be configured, and an admin or tool-authorized victim for server-side code execution.

CVSS severity7.3
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Open WebUI before 0.10.0 allows remote authenticated users to execute server-side code through a shared chat payload. The same-origin Pyodide web worker exposes pyfetch, fetch, and XMLHttpRequest, which attach the victim's session cookie to attacker-chosen application API requests. Exploitation requires a low-privileged user to share the payload, a victim to click Run, Pyodide to be configured, and an admin or tool-authorized victim for server-side code execution.

The record

CVE
CVE-2026-59214
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=< 0.10.0

Published CVSS scores

7.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
9.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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