JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing 'await' caused the is_install_allowed coroutine to never execute, so the extension allowlist/blocklist check was not enforced for direct callers of install(). The stock JupyterLab HTTP API and Extension Manager UI are not affected, as they perform a separate, correctly awaited check. The issue affects only deployments where a custom extension or downstream integration imports PyPIExtensionManager and calls install() directly with a package name influenced by untrusted input, an allowlist/blocklist is configured, the PyPI Extension Manager is enabled, and kernels and terminals are disabled or delegated to remote hosts. Fixed in JupyterLab 4.6.2 and 4.5.10.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
jupyterlab jupyterlab unaffected
Version Status Constraints
4.6.0 affected < 4.6.1
4.6.1 unaffected —
jupyterlab jupyterlab unaffected
Version Status Constraints
0 affected < 4.5.10
4.5.10 unaffected —

No data.

No data.

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Project Subscriptions

Vendors Products
Jupyter Subscribe
Jupyterlab Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j cve-icon cve-icon
https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager cve-icon cve-icon
History

Thu, 13 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 13 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
Description JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing 'await' caused the is_install_allowed coroutine to never execute, so the extension allowlist/blocklist check was not enforced for direct callers of install(). The stock JupyterLab HTTP API and Extension Manager UI are not affected, as they perform a separate, correctly awaited check. The issue affects only deployments where a custom extension or downstream integration imports PyPIExtensionManager and calls install() directly with a package name influenced by untrusted input, an allowlist/blocklist is configured, the PyPI Extension Manager is enabled, and kernels and terminals are disabled or delegated to remote hosts. Fixed in JupyterLab 4.6.2 and 4.5.10.
Title JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager
First Time appeared Jupyter
Jupyter jupyterlab
Weaknesses CWE-284
CPEs cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:*
Vendors & Products Jupyter
Jupyter jupyterlab
References
Metrics cvssV3_1

{'score': 0, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N'}

cvssV4_0

{'score': 0, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-13T12:57:46.464Z

Reserved: 2026-08-13T11:17:25.160Z

Link: CVE-2026-73626

cve-icon Vulnrichment

Updated: 2026-08-13T12:57:41.554Z

cve-icon NVD

Status : Received

Published: 2026-08-13T12:17:27.897

Modified: 2026-08-13T13:19:21.833

Link: CVE-2026-73626

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T13:15:04Z

Weaknesses