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CVE-2026-73626— JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager

Quick assessment

Affected
jupyterlab jupyterlab
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JupyterLab jupyterlab是JupyterLab基金会的一款Web应用开发框架。 jupyterlab 4.6.0版本至4.6.1版本和4.5.9及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于PyPIExtensionManager.install()方法缺少'await'，导致is_install_allowed协程从未执行，扩展允许列表/阻止列表检查未强制执行，可能绕过安装限制。

CVSS 7.5 · High EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1195.002 · Compromise Software Supply Chain

Affected Version Matrix 4

VendorProduct Version RangeStatus
jupyterlab jupyterlab 4.6.0< 4.6.1 affected
4.6.1 unaffected
< 4.5.10 affected
4.5.10 unaffected
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I. Basic Information for CVE-2026-73626

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
jupyterlab 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterLab jupyterlab是JupyterLab基金会的一款Web应用开发框架。 jupyterlab 4.6.0版本至4.6.1版本和4.5.9及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于PyPIExtensionManager.install()方法缺少'await'，导致is_install_allowed协程从未执行，扩展允许列表/阻止列表检查未强制执行，可能绕过安装限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyterlab jupyterlab 4.6.0 ~ 4.6.1 -
jupyterlab jupyterlab 0 ~ 4.5.10 -

II. Public POCs for CVE-2026-73626

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III. Intelligence Information for CVE-2026-73626

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Vendor Advisories for CVE-2026-73626 (2)

Same Patch Batch · jupyterlab · 2026-08-13 · 4 CVEs total

CVE-2026-73417 8.6 HIGH JupyterLab: Cross-site scripting (XSS) via crafted settings file (`overrides.json`)
CVE-2026-73416 6.1 MEDIUM jupyterlab: PyPI extension blocklist package-name canonicalization bypass
CVE-2026-73627 6.0 MEDIUM JupyterLab 4.6.0 Plugin Manager Lock-Rule Enforcement Bypass

IV. Related Vulnerabilities

Same product: jupyterlab
Same vendor: jupyterlab
Same weakness: CWE-284

V. Comments for CVE-2026-73626

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