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CVE-2026-40864— JupyterHub: Cross-origin form POSTs bypass XSRF

CVSS 5.4 · Medium EPSS 0.01% · P3

Affected Version Matrix 1

VendorProductVersion RangeStatus
jupyterhubjupyterhub>= 4.1.0, < 5.4.5affected
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I. Basic Information for CVE-2026-40864

Vulnerability Information
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Vulnerability Title
JupyterHub: Cross-origin form POSTs bypass XSRF
Source: NVD (National Vulnerability Database)
Vulnerability Description
JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. In versions 4.1.0 through 5.4.4, XSRF protection (updated in 4.1.0) inappropriately treated requests with Sec-Fetch-Mode: no-cors as same-origin requests, bypassing XSRF checks. The JSON API is not affected, only HTTP form endpoints, such as /hub/spawn and /hub/accept-share, meaning attackers could trigger server spawn (but not access the server) and if the attacker is a JupyterHub user permitted to share access to their server, cause a user to accept a share and have access to the attacker's server. This issue has been fixed in version 5.4.5. If developers are unable to immediately upgrade, they can temporarily mitigate this issue by dropping requests to JupyterHub with Sec-Fetch-Mode: no-cors if they are using a reverse proxy.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨站请求伪造(CSRF)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
jupyterhubjupyterhub >= 4.1.0, < 5.4.5 -

II. Public POCs for CVE-2026-40864

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III. Intelligence Information for CVE-2026-40864

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Patches & Fixes for CVE-2026-40864 (1)

Vendor Advisories for CVE-2026-40864 (1)

IV. Related Vulnerabilities

Same product: jupyterhub
Same vendor: jupyterhub
Same weakness: CWE-352

V. Comments for CVE-2026-40864

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