{"id":"CVE-2026-67338","aliases":["BIT-jupyterlab-2026-67338","DEBIAN-CVE-2026-67338","EUVD-2026-51849","GHSA-r75g-r7w6-363h","GHSA-vmhf-c436-hxj4","OESA-2026-4168","UBUNTU-CVE-2026-67338"],"status":"published","title":"JupyterLab before 4.5.9 Stored XSS via Extension Manager","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","severity":{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00305,"percentile":0.23546,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-84"],"published":"2026-06-19T15:11:17Z","modified":"2026-10-28T02:30:50Z","fixes":[{"ecosystem":"PyPI","package":"jupyterlab","fixed_in":["4.5.9"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"jupyterlab","fixed_in":["4.5.9"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"jupyterlab","fixed_in":["4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"jupyterlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"4.5.8"},{"fixed":"4.5.9"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"jupyterlab","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.5.9"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"jupyterlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.11+ds1+~cs11.25.27-7","4.0.11+ds1+~cs11.25.27-8","4.0.11+ds1+~cs11.25.27-9","4.0.11+ds2+~cs11.25.27-1","4.0.11+ds2+~cs11.25.27-3","4.0.11+ds3+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-2","4.0.11+ds4+~cs11.25.27-3","4.0.11+ds4+~cs11.25.27-4","4.0.11+ds5+~cs11.25.27-1","4.0.13+ds1+~2.0.1+~cs1.4.4-1","4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8","4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-5","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-6","4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1"]},{"source":"osv","ecosystem":"Debian:14","package":"jupyterlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4"}]}],"versions":["4.0.11+ds1+~cs11.25.27-7","4.0.11+ds1+~cs11.25.27-8","4.0.11+ds1+~cs11.25.27-9","4.0.11+ds2+~cs11.25.27-1","4.0.11+ds2+~cs11.25.27-3","4.0.11+ds3+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-1","4.0.11+ds4+~cs11.25.27-2","4.0.11+ds4+~cs11.25.27-3","4.0.11+ds4+~cs11.25.27-4","4.0.11+ds5+~cs11.25.27-1","4.0.13+ds1+~2.0.1+~cs1.4.4-1","4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7","4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8","4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2","4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3","4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1"]},{"source":"osv","ecosystem":"PyPI","package":"jupyterlab","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.9"}]}],"versions":["0.0.1","0.0.10","0.0.13","0.0.2","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9","0.1.1","0.1.2","0.10.0","0.11.0","0.11.1","0.11.2","0.11.3","0.12.0","0.12.1","0.13.0","0.13.1","0.13.2","0.14.0","0.15.0","0.15.1","0.16.0","0.16.2","0.17.0","0.17.1","0.17.2","0.17.4","0.17.5","0.18.0","0.18.0.dev1","0.18.1","0.19.0","0.2.0","0.20.0","0.20.0rc1","0.20.1","0.20.2","0.20.3","0.20.4","0.21.0","0.21.0rc1","0.21.0rc2","0.21.0rc3","0.21.0rc4","0.21.0rc5","0.22.0","0.22.0rc0","0.22.1","0.23.0","0.23.0rc0","0.23.0rc1","0.23.1","0.23.2","0.24.0","0.24.0rc0","0.24.0rc1","0.24.0rc2","0.24.1","0.25.0","0.25.0rc0","0.25.0rc1","0.25.1","0.25.2","0.25.2rc0","0.26.0","0.26.0rc0","0.26.0rc1","0.26.1","0.26.2","0.26.3","0.26.4","0.26.5","0.27.0","0.27.0rc0","0.27.0rc1","0.27.0rc2","0.27.0rc3","0.27.0rc4","0.27.0rc5","0.27.1","0.27.2","0.28.0","0.28.0rc0","0.28.0rc1","0.28.0rc2","0.28.0rc3","0.28.1","0.28.10","0.28.11","0.28.12","0.28.13","0.28.14","0.28.15","0.28.2","0.28.3","0.28.4","0.28.5","0.28.6","0.28.7","0.28.8","0.29.0","0.29.0rc0","0.29.1","0.29.2","0.3.0","0.30.0","0.30.0rc0","0.30.0rc1","0.30.1","0.30.2","0.30.3","0.30.4","0.30.5","0.30.6","0.31.0","0.31.0rc0","0.31.0rc1","0.31.0rc2","0.31.1","0.31.10","0.31.11","0.31.12","0.31.2","0.31.3","0.31.4","0.31.5","0.31.6","0.31.7","0.31.8","0.31.9","0.32.0","0.32.0rc0","0.32.0rc1","0.32.1","0.33.0","0.33.0rc0","0.33.0rc1","0.33.1","0.33.10","0.33.11","0.33.12","0.33.2","0.33.3","0.33.4","0.33.5","0.33.6","0.33.7","0.33.8","0.33.9","0.34.0","0.34.0rc0","0.34.0rc1","0.34.0rc2","0.34.1","0.34.10","0.34.11","0.34.12","0.34.2","0.34.3","0.34.4","0.34.5",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before 4.5.9 Stored XSS via Extension Manager","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-08-01T12:22:17.437Z","modified":"2026-10-08T15:24:13.033Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T14:20:06.562031Z"}],"euvd":[{"id":"EUVD-2026-51849","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-08-01T12:22:17Z","modified":"2026-10-08T15:24:13Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"updated_at":"2026-11-02T17:27:31.218078Z"}],"ghsa":[{"id":"GHSA-r75g-r7w6-363h","title":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension...","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-08-01T15:30:29Z","modified":"2026-08-01T15:30:37Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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","level":"medium"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T15:10:01.548476Z"},{"id":"GHSA-vmhf-c436-hxj4","title":"JupyterLab: Stored XSS in extension manager through package metadata unsanitized URI protocol","description":"A malicious PyPI package can place a `javascript:` URL in its `[project.urls]` metadata. JupyterLab's Extension Manager renders this as the extension's home-page link without validating the protocol, so a user who clicks the extension name executes attacker-controlled JavaScript in the JupyterLab origin.\n\n### Details\n\nOne of the PyPI package's URL (jupyterlab/extensions/pypi.py) is copied straight into the `homepage_url` rendered by the frontend in packages/extensionmanager/src/widget.tsx#L77-L88.\n\n```python\nbest_guess_home_url = (\n    homepage_url            # home_page / [project.urls] Homepage\n    or data.get(\"project_url\")\n    or data.get(\"package_url\")\n    or documentation_url    # docs_url / [project.urls] Documentation\n    or source_url           # [project.urls] Source Code\n    or bug_tracker_url      # bugtrack_url / [project.urls] Bug Tracker\n)\n\n# homepage_url=best_guess_home_url\n```\n\n```tsx\n{entry.homepage_url ? (\n  \u003ca href={entry.homepage_url} target=\"_blank\" rel=\"noopener noreferrer\" ...\u003e\n    {entry.name}\n  \u003c/a\u003e\n) : ( \u003cdiv\u003e{entry.name}\u003c/div\u003e )}\n```\n\n### Impact\n\nAn attacker needs to publish a package to PyPI (no access to the target). When the package appears in a victim's extension manager list and the victim clicks the extension name, the payload runs in the JupyterLab origin.\n\nPreconditions: Extension Manager enabled with the default PyPI source, the malicious package appears in the victim's list/search results.\n\n### Patches\nPatched in [4.5.9](https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.9), commits [4e61e07](https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6) and [d5d961f](https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12)","status":"published","published":"2026-06-19T15:11:17Z","modified":"2026-06-19T15:11:18Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T14:40:30.53004Z"}],"nvd":[{"id":"CVE-2026-67338","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-08-01T13:17:04.843Z","modified":"2026-10-08T16:17:32.273Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T14:12:34.290716Z"}],"osv":[{"id":"CVE-2026-67338","title":"JupyterLab before 4.5.9 Stored XSS via Extension Manager","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-08-01T12:22:17.437Z","modified":"2026-10-28T02:30:50.278839092Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T15:45:14.46177Z"},{"id":"DEBIAN-CVE-2026-67338","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-08-01T13:17:04.843Z","modified":"2026-10-09T09:47:23.101989245Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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","level":"medium"}],"updated_at":"2026-11-02T15:46:01.68444Z"},{"id":"GHSA-vmhf-c436-hxj4","title":"JupyterLab: Stored XSS in extension manager through package metadata unsanitized URI protocol","description":"A malicious PyPI package can place a `javascript:` URL in its `[project.urls]` metadata. JupyterLab's Extension Manager renders this as the extension's home-page link without validating the protocol, so a user who clicks the extension name executes attacker-controlled JavaScript in the JupyterLab origin.\n\n### Details\n\nOne of the PyPI package's URL (jupyterlab/extensions/pypi.py) is copied straight into the `homepage_url` rendered by the frontend in packages/extensionmanager/src/widget.tsx#L77-L88.\n\n```python\nbest_guess_home_url = (\n    homepage_url            # home_page / [project.urls] Homepage\n    or data.get(\"project_url\")\n    or data.get(\"package_url\")\n    or documentation_url    # docs_url / [project.urls] Documentation\n    or source_url           # [project.urls] Source Code\n    or bug_tracker_url      # bugtrack_url / [project.urls] Bug Tracker\n)\n\n# homepage_url=best_guess_home_url\n```\n\n```tsx\n{entry.homepage_url ? (\n  \u003ca href={entry.homepage_url} target=\"_blank\" rel=\"noopener noreferrer\" ...\u003e\n    {entry.name}\n  \u003c/a\u003e\n) : ( \u003cdiv\u003e{entry.name}\u003c/div\u003e )}\n```\n\n### Impact\n\nAn attacker needs to publish a package to PyPI (no access to the target). When the package appears in a victim's extension manager list and the victim clicks the extension name, the payload runs in the JupyterLab origin.\n\nPreconditions: Extension Manager enabled with the default PyPI source, the malicious package appears in the victim's list/search results.\n\n### Patches\nPatched in [4.5.9](https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.9), commits [4e61e07](https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6) and [d5d961f](https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12)","status":"published","published":"2026-06-19T15:11:17Z","modified":"2026-10-14T11:11:02.670615521Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"cwes":["CWE-84"],"updated_at":"2026-11-02T15:46:57.348035Z"},{"id":"OESA-2026-4168","title":"python-jupyterlab security update","description":"JupyterLab is the next-generation user interface for Project Jupyter offering all the familiar building blocks of the classic Jupyter Notebook (notebook, terminal, text editor, file browser, rich outputs, etc.) in a flexible and powerful user interface.\r\n\r\nSecurity Fix(es):\n\nJupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.(CVE-2026-67338)\n\nJupyterLab versions \u0026gt;=4.6.0,\u0026lt;=4.6.1 and \u0026lt;=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing \u0026apos;await\u0026apos; 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.(CVE-2026-73626)","status":"published","published":"2026-09-30T13:47:15Z","modified":"2026-10-01T02:00:04.278032803Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"UBUNTU-CVE-2026-67338","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-08-01T13:17:00Z","modified":"2026-10-17T13:00:36.188003594Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"},{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:56:53.710209Z"},{"id":"BIT-jupyterlab-2026-67338","title":"JupyterLab before 4.5.9 Stored XSS via Extension Manager","description":"JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.","status":"published","published":"2026-10-14T08:45:27.772Z","modified":"2026-10-14T11:11:02.670615521Z","updated_at":"2026-11-02T15:28:31.782692Z"}]}}