CVE-2026-40171

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40171", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-09T19:31:56.015Z", "datePublished": "2026-05-06T19:36:32.072Z", "dateUpdated": "2026-05-08T03:55:41.465Z"}, "containers": {"cna": {"title": "Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.4, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9"}], "affected": [{"vendor": "jupyter", "product": "notebook", "versions": [{"version": ">=7.0.0, <= 7.5.5", "status": "affected"}]}, {"vendor": "jupyterlab", "product": "help-extension", "versions": [{"version": "<=4.5.6", "status": "affected"}]}, {"vendor": "jupyterlab", "product": "jupyterlab", "versions": [{"version": "<= 4.5.6", "status": "affected"}]}, {"vendor": "jupyter-notebook", "product": "help-extension", "versions": [{"version": ">=7.0.0,<= 7.5.5", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-06T19:36:32.072Z"}, "descriptions": [{"lang": "en", "value": "In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click.\n\nAn attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and creating terminals for shell access. This issue has been fixed in Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6, and @jupyterlab/help-extension 4.5.7. As a workaround, disable the affected help extensions or set allowCommandLinker to false in the sanitizer configuration."}], "source": {"advisory": "GHSA-rch3-82jr-f9w9", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-07T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-40171"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-08T03:55:41.465Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-40171", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-05-07T12:24:07.459699Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-07T12:24:19.818Z"}}], "cna": {"title": "Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker", "source": {"advisory": "GHSA-rch3-82jr-f9w9", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 8.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH"}}], "affected": [{"vendor": "jupyter", "product": "notebook", "versions": [{"status": "affected", "version": ">=7.0.0, <= 7.5.5"}]}, {"vendor": "jupyterlab", "product": "help-extension", "versions": [{"status": "affected", "version": "<=4.5.6"}]}, {"vendor": "jupyterlab", "product": "jupyterlab", "versions": [{"status": "affected", "version": "<= 4.5.6"}]}, {"vendor": "jupyter-notebook", "product": "help-extension", "versions": [{"status": "affected", "version": ">=7.0.0,<= 7.5.5"}]}], "references": [{"url": "https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9", "name": "https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9", "tags": ["x_refsource_CONFIRM"]}], "descriptions": [{"lang": "en", "value": "In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click.\n\nAn attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and creating terminals for shell access. This issue has been fixed in Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6, and @jupyterlab/help-extension 4.5.7. As a workaround, disable the affected help extensions or set allowCommandLinker to false in the sanitizer configuration."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-06T19:36:32.072Z"}}}, "cveMetadata": {"cveId": "CVE-2026-40171", "state": "PUBLISHED", "dateUpdated": "2026-05-08T03:55:41.465Z", "dateReserved": "2026-04-09T19:31:56.015Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-05-06T19:36:32.072Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "notebook", "vendor": "jupyter", "versions": [{"status": "affected", "version": ">=7.0.0, <= 7.5.5"}]}, {"product": "help-extension", "vendor": "jupyterlab", "versions": [{"status": "affected", "version": "<=4.5.6"}]}, {"product": "jupyterlab", "vendor": "jupyterlab", "versions": [{"status": "affected", "version": "<= 4.5.6"}]}, {"product": "help-extension", "vendor": "jupyter-notebook", "versions": [{"status": "affected", "version": ">=7.0.0,<= 7.5.5"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click.\n\nAn attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and creating terminals for shell access. This issue has been fixed in Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6, and @jupyterlab/help-extension 4.5.7. As a workaround, disable the affected help extensions or set allowCommandLinker to false in the sanitizer configuration."}, {"lang": "es", "value": "En las versiones de Jupyter Notebook 7.0.0 a 7.5.5, las versiones de JupyterLab 4.5.6 y anteriores, y los paquetes correspondientes @jupyter-notebook/help-extension y @jupyterlab/help-extension anteriores a 7.5.6 y 4.5.7, un problema de cross-site scripting almacenado en el enlazador de comandos de ayuda puede encadenarse con contenido de notebook controlado por el atacante para robar tokens de autenticaci\u00f3n con un solo clic.\n\nUn atacante puede crear un archivo de notebook malicioso que contenga elementos que parezcan indistinguibles de los controles leg\u00edtimos y activar la ejecuci\u00f3n cuando un usuario interact\u00faa con ellos. La explotaci\u00f3n exitosa permite el robo del token de autenticaci\u00f3n del usuario y la toma de control completa de la sesi\u00f3n de Jupyter a trav\u00e9s de la API REST, incluyendo la lectura de archivos, la creaci\u00f3n o modificaci\u00f3n de archivos, el acceso a kernels para ejecutar c\u00f3digo arbitrario y la creaci\u00f3n de terminales para acceso a la shell. Este problema ha sido solucionado en Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6 y @jupyterlab/help-extension 4.5.7. Como soluci\u00f3n alternativa, deshabilite las extensiones de ayuda afectadas o establezca allowCommandLinker en false en la configuraci\u00f3n del saneador."}], "id": "CVE-2026-40171", "lastModified": "2026-10-26T19:10:00.163", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.4, "baseSeverity": "HIGH", "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": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40171", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-07T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-05-06T20:16:31.857", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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