{"id":"BIT-jupyterlab-2026-40171","revision":null,"records":[{"revision":"d2636b48bede4117af764c99d87c7168","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-40171","aliases":[],"title":"Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker","description":"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.","state":0,"publishedAt":"2026-05-06T19:36:32.072+00:00","modifiedAt":"2026-05-08T03:55:41.465+00:00","affected":[{"ecosystem":"Vendor product","name":"notebook","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jupyter\",\n                    \"product\": \"notebook\",\n                    \"versions\": [\n                        {\n                            \"version\": \">=7.0.0, <= 7.5.5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"help-extension","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jupyterlab\",\n                    \"product\": \"help-extension\",\n                    \"versions\": [\n                        {\n                            \"version\": \"<=4.5.6\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"jupyterlab","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jupyterlab\",\n                    \"product\": \"jupyterlab\",\n                    \"versions\": [\n                        {\n                            \"version\": \"<= 4.5.6\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"help-extension","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jupyter-notebook\",\n                    \"product\": \"help-extension\",\n                    \"versions\": [\n                        {\n                            \"version\": \">=7.0.0,<= 7.5.5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.4,"severity":"HIGH"}],"references":["https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-40171","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-40171","identifiers":["CVE-2026-40171"]},"retained":false,"historicalAffected":[]},{"revision":"fc0d92c1e4df4ff8b3b980cbaefeedf9","observedAt":"2026-11-07T08:36:18.629+00:00","statement":{"source":"euvd","id":"EUVD-2026-28153","aliases":["CVE-2026-40171","GHSA-rch3-82jr-f9w9"],"title":"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 is…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":8.4,"severity":null}],"references":["https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28153","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 6, 2026, 7:36:32 PM","dateUpdated":"May 8, 2026, 3:55:41 AM"},"relatedAdvisories":[{"id":"openSUSE-SU-2026:10748-1","title":"jupyter-jupyterlab-4.5.7-1.1 on GA media","vulnerabilityIds":["CVE-2026-40171","CVE-2026-42266","CVE-2026-42557"]},{"id":"openSUSE-SU-2026:10749-1","title":"jupyter-notebook-7.5.6-1.1 on GA media","vulnerabilityIds":["CVE-2026-40171","CVE-2026-42557"]},{"id":"RHSA-2026:43038","title":"Red Hat Security Advisory: Migration Toolkit for Applications","vulnerabilityIds":["CVE-2026-5422","CVE-2026-6322","CVE-2026-13676","CVE-2026-25681","CVE-2026-27136","CVE-2026-28684","CVE-2026-33079","CVE-2026-33811","CVE-2026-34993","CVE-2026-35397","CVE-2026-39820","CVE-2026-39821","CVE-2026-40110","CVE-2026-40171","CVE-2026-42266","CVE-2026-42499","CVE-2026-42504","CVE-2026-42557","CVE-2026-42561","CVE-2026-44431","CVE-2026-44432","CVE-2026-44727","CVE-2026-44843","CVE-2026-45292","CVE-2026-48526","CVE-2026-48710","CVE-2026-48746","CVE-2026-48990","CVE-2026-54283","CVE-2026-59939"]},{"id":"RHSA-2026:60520","title":"Red Hat Security Advisory: RHOAI 3.4.4 - Red Hat OpenShift AI","vulnerabilityIds":["CVE-2025-66471","CVE-2025-66626","CVE-2025-71329","CVE-2025-71330","CVE-2026-0545","CVE-2026-2614","CVE-2026-5241","CVE-2026-5422","CVE-2026-6322","CVE-2026-6734","CVE-2026-8643","CVE-2026-9697","CVE-2026-12143","CVE-2026-12151","CVE-2026-12243","CVE-2026-12481","CVE-2026-13149","CVE-2026-13311","CVE-2026-13676","CVE-2026-13717","CVE-2026-14450","CVE-2026-15154","CVE-2026-15218","CVE-2026-15378","CVE-2026-15467","CVE-2026-15581","CVE-2026-16745","CVE-2026-18608","CVE-2026-18611","CVE-2026-18617","CVE-2026-18620","CVE-2026-18621","CVE-2026-18948","CVE-2026-18951","CVE-2026-18982","CVE-2026-25681","CVE-2026-27136","CVE-2026-32280","CVE-2026-32283","CVE-2026-33079","CVE-2026-33245","CVE-2026-33811","CVE-2026-33814","CVE-2026-34993","CVE-2026-35397","CVE-2026-39820","CVE-2026-39821","CVE-2026-39828","CVE-2026-39829","CVE-2026-39830","CVE-2026-39831","CVE-2026-39835","CVE-2026-40171","CVE-2026-41672","CVE-2026-41673","CVE-2026-41675","CVE-2026-42211","CVE-2026-42215","CVE-2026-42264","CVE-2026-42266","CVE-2026-42284","CVE-2026-42305","CVE-2026-42311","CVE-2026-42338","CVE-2026-42342","CVE-2026-42499","CVE-2026-42502","CVE-2026-42508","CVE-2026-42557","CVE-2026-44017","CVE-2026-44018","CVE-2026-44020","CVE-2026-44240","CVE-2026-44244","CVE-2026-44289","CVE-2026-44290","CVE-2026-44291","CVE-2026-44292","CVE-2026-44293","CVE-2026-44486","CVE-2026-44487","CVE-2026-44488","CVE-2026-44492","CVE-2026-44494","CVE-2026-44495","CVE-2026-44496","CVE-2026-44513","CVE-2026-44660","CVE-2026-44705","CVE-2026-44724","CVE-2026-44727","CVE-2026-44827","CVE-2026-44843","CVE-2026-45292","CVE-2026-45623","CVE-2026-45736","CVE-2026-45740","CVE-2026-45804","CVE-2026-46595","CVE-2026-46597","CVE-2026-46625","CVE-2026-47214","CVE-2026-48526","CVE-2026-48710","CVE-2026-48712","CVE-2026-48779","CVE-2026-48801","CVE-2026-49476","CVE-2026-49477","CVE-2026-49851","CVE-2026-49978","CVE-2026-50193","CVE-2026-53550","CVE-2026-54058","CVE-2026-54060","CVE-2026-54283","CVE-2026-54293","CVE-2026-55379","CVE-2026-55380","CVE-2026-55685","CVE-2026-56121","CVE-2026-56208","CVE-2026-56209","CVE-2026-56210","CVE-2026-56211","CVE-2026-58049","CVE-2026-59197","CVE-2026-59199","CVE-2026-59200","CVE-2026-59204","CVE-2026-59205","CVE-2026-59869","CVE-2026-59873","CVE-2026-59874","CVE-2026-59884","CVE-2026-59885","CVE-2026-59886","CVE-2026-64835","CVE-2026-64849","CVE-2026-69152","CVE-2026-69192","CVE-2026-69243","CVE-2026-69244"]},{"id":"RHSA-2026:65126","title":"Red Hat Security Advisory: RHOAI 2.25.11 - Red Hat OpenShift AI","vulnerabilityIds":["CVE-2025-61729","CVE-2025-67030","CVE-2026-4926","CVE-2026-6734","CVE-2026-9563","CVE-2026-9697","CVE-2026-12151","CVE-2026-12243","CVE-2026-13149","CVE-2026-15075","CVE-2026-15154","CVE-2026-15378","CVE-2026-15581","CVE-2026-16745","CVE-2026-18608","CVE-2026-18611","CVE-2026-18617","CVE-2026-18620","CVE-2026-18621","CVE-2026-25681","CVE-2026-26996","CVE-2026-27136","CVE-2026-27904","CVE-2026-30922","CVE-2026-32283","CVE-2026-33231","CVE-2026-33810","CVE-2026-33811","CVE-2026-33814","CVE-2026-33870","CVE-2026-33871","CVE-2026-34445","CVE-2026-35536","CVE-2026-39821","CVE-2026-39829","CVE-2026-39835","CVE-2026-40171","CVE-2026-40192","CVE-2026-40895","CVE-2026-41178","CVE-2026-42027","CVE-2026-42215","CVE-2026-42284","CVE-2026-42338","CVE-2026-42502","CVE-2026-42508","CVE-2026-42578","CVE-2026-42579","CVE-2026-42581","CVE-2026-42583","CVE-2026-42584","CVE-2026-42587","CVE-2026-44240","CVE-2026-44244","CVE-2026-44249","CVE-2026-44431","CVE-2026-44893","CVE-2026-45112","CVE-2026-45416","CVE-2026-45623","CVE-2026-45674","CVE-2026-45736","CVE-2026-45819","CVE-2026-47691","CVE-2026-48043","CVE-2026-48059","CVE-2026-48586","CVE-2026-48779","CVE-2026-49978","CVE-2026-50010","CVE-2026-50193","CVE-2026-53550","CVE-2026-54293","CVE-2026-54512","CVE-2026-55685","CVE-2026-55831","CVE-2026-55833","CVE-2026-55851","CVE-2026-56745","CVE-2026-56746","CVE-2026-56819","CVE-2026-56853","CVE-2026-56858","CVE-2026-56859","CVE-2026-56860","CVE-2026-56862","CVE-2026-59869","CVE-2026-59873","CVE-2026-59874","CVE-2026-59885","CVE-2026-59899","CVE-2026-66036","CVE-2026-66039","CVE-2026-67313","CVE-2026-67320","CVE-2026-67322","CVE-2026-67323","CVE-2026-67324","CVE-2026-67325","CVE-2026-68494","CVE-2026-69112","CVE-2026-69152","CVE-2026-69192","CVE-2026-69243","CVE-2026-69244","CVE-2026-71281","CVE-2026-73088","CVE-2026-73089","CVE-2026-73415","CVE-2026-73417","CVE-2026-73566","CVE-2026-73622","CVE-2026-73623","CVE-2026-73624","CVE-2026-73625","CVE-2026-73627","CVE-2026-73643"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-28153","identifiers":["EUVD-2026-28153","CVE-2026-40171","GHSA-rch3-82jr-f9w9"]},"retained":false,"historicalAffected":[]},{"revision":"637edd38638e41cfb7564707b9876cc9","observedAt":"2026-10-27T10:09:56.341+00:00","statement":{"source":"nvd","id":"CVE-2026-40171","aliases":[],"title":"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 is…","description":"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.","state":0,"publishedAt":"2026-05-06T20:16:31.857+00:00","modifiedAt":"2026-10-26T19:10:00.163+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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","score":8.4,"severity":"HIGH"}],"references":["https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40171","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-79"],"productCriteria":[],"sourceDates":{"published":"2026-05-06T20:16:31.857","lastModified":"2026-10-26T19:10:00.163"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-40171","identifiers":["CVE-2026-40171"]},"retained":false,"historicalAffected":[]},{"revision":"9b842afdfe184395a6a370413142eb38","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-rch3-82jr-f9w9","aliases":["BIT-jupyter-base-notebook-2026-40171","BIT-jupyter-notebook-2026-40171","BIT-jupyterlab-2026-40171","CVE-2026-40171","PYSEC-2026-2538","PYSEC-2026-2682"],"title":"Jupyter Notebook Vulnerable to Authentication Token Theft via CommandLinker XSS","description":"### Impact\n\nA stored Cross-Site Scripting (XSS) vulnerability in Jupyter Notebook allows attackers to steal authentication tokens from users who open malicious notebook files and interact with elements that the attacker can make look indistinguishable from legitimate controls (single click interaction).\n\nThe vulnerability enables complete account takeover through the Jupyter REST API, allowing the attacker to:\n1. Read all files\n2. Modify/create files\n3. Access running kernels and execute arbitrary code\n4. Create terminals for shell access\n\n### Patches\n\nJupyter Notebook 7.5.6 and JupyterLab 4.5.7 include patches for this vulnerability.\n\n### Workarounds\n\nThe help extension can be disabled via CLI:\n\n```\njupyter labextension disable @jupyter-notebook/help-extension\njupyter labextension disable @jupyterlab/help-extension\n```\n\n### Hardening\n\nThe patched versions include a toggle to disable the command linker functionality altogether, for example via `overrides.json`:\n\n```json\n{\n  \"@jupyterlab/apputils-extension:sanitizer\": {\n    \"allowCommandLinker\": false\n  }\n}\n```\n\n### Resources\n\n- https://jupyterlab.readthedocs.io/en/latest/user/commands.html#commands-in-markdown-output-and-files\n\n### Acknowledgments\n\nReported by Daniel Teixeira - NVIDIA AI Red 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