{"id":"BIT-jupyterlab-2026-73626","summary":"JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager","details":"JupyterLab versions \u003e=4.6.0,\u003c=4.6.1 and \u003c=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.","aliases":["CVE-2026-73626","GHSA-whvh-wf3x-g77j"],"modified":"2026-09-25T14:25:48.030827903Z","published":"2026-09-25T12:23:14.880Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:python:*:*"]},"references":[{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73626"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager"}],"affected":[{"package":{"name":"jupyterlab","ecosystem":"Bitnami","purl":"pkg:bitnami/jupyterlab"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.5.10"},{"introduced":"4.6.0"},{"fixed":"4.6.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/jupyterlab/BIT-jupyterlab-2026-73626.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.0"}