{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-73626", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-13T11:17:25.160Z", "datePublished": "2026-08-13T11:28:25.551Z", "dateUpdated": "2026-08-13T11:28:25.551Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-08-13T11:28:25.551Z"}, "datePublic": "2026-07-21T00:00:00.000Z", "title": "JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Access Control", "cweId": "CWE-284", "type": "CWE"}]}], "affected": [{"vendor": "jupyterlab", "product": "jupyterlab", "defaultStatus": "unaffected", "packageURL": "pkg:pypi/jupyterlab", "versions": [{"version": "4.6.0", "status": "affected", "versionType": "semver", "lessThan": "4.6.1"}, {"version": "4.6.1", "status": "unaffected", "versionType": "semver"}]}, {"vendor": "jupyterlab", "product": "jupyterlab", "defaultStatus": "unaffected", "packageURL": "pkg:pypi/jupyterlab", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "4.5.10"}, {"version": "4.5.10", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6.0", "versionEndExcluding": "4.6.1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.5.10"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 0, "baseSeverity": "NONE"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseScore": 0, "baseSeverity": "NONE"}}], "references": [{"url": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-whvh-wf3x-g77j)"}, {"name": "VulnCheck Advisory: JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager"}], "credits": [{"lang": "en", "value": "de3erve-hunter", "type": "reporter"}, {"lang": "en", "value": "MUFFANUJ", "type": "finder"}, {"lang": "en", "value": "krassowski", "type": "coordinator"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:pypi/jupyterlab", "product": "jupyterlab", "vendor": "jupyterlab", "versions": [{"lessThan": "4.6.1", "status": "affected", "version": "4.6.0", "versionType": "semver"}, {"status": "unaffected", "version": "4.6.1", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "packageURL": "pkg:pypi/jupyterlab", "product": "jupyterlab", "vendor": "jupyterlab", "versions": [{"lessThan": "4.5.10", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "4.5.10", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-73626", "lastModified": "2026-08-13T12:17:27.897", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 0.0, "baseSeverity": "NONE", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 0.0, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 0.0, "baseSeverity": "NONE", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-08-13T12:17:27.897", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

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