{"id":"GHSA-gj55-2xf9-67rq","aliases":[],"status":"published","title":"HTML injection in JupyterLite leading to DOM Clobbering","description":"### Impact\n\nThe vulnerability depends on user interaction by opening a malicious notebook with Markdown cells, or Markdown file using JupyterLab preview feature.\n\nA malicious user can access any data accessible from JupyterLite and perform arbitrary actions in JupyterLite environment.\n\n### Patches\n\nJupyterLite 0.4.1 was patched.\n\n### Workarounds\n\nThere is no workaround for the underlying DOM Clobbering susceptibility. However, select plugins can be disabled on deployments which cannot update in a timely fashion to minimise the risk. These are:\n- `@jupyterlab/mathjax-extension:plugin` - users will loose ability to preview mathematical equations \n- `@jupyterlab/markdownviewer-extension:plugin` - users will loose ability to open Markdown previews\n- `@jupyterlab/mathjax2-extension:plugin` (if installed with optional `jupyterlab-mathjax2` package) - an older version of the mathjax plugin for JupyterLab 4.x\n\nTo disable these extensions populate the `disabledExtensions` key in `jupyter-config-data` stanza of `jupyter-lite.json` as documented on https://jupyterlite.readthedocs.io/en/stable/howto/configure/config_files.html#jupyter-lite-json\n\n```json\n{\n  \"jupyter-lite-schema-version\": 0,\n  \"jupyter-config-data\": {\n    \"appName\": \"My JupyterLite App\",\n    \"disabledExtensions\": [\n      \"@jupyterlab/markdownviewer-extension:plugin\",\n      \"@jupyterlab/mathjax-extension:plugin\",\n      \"@jupyterlab/mathjax2-extension:plugin\"\n    ]\n  }\n}\n```\n\nTo confirm that the plugins were disabled manual inspection of the built page is required.\n\n### References\n\nUpstream advisory: https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-9q39-rmj3-p4r2\n\n### Notes\n\nThis change has a potential to break rendering of some markdown. There is a setting in Sanitizer which allows to revert to the previous sanitizer settings (`allowNamedProperties`).","severity":{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"medium","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2024-09-06T19:51:19Z","modified":"2024-11-28T05:39:07Z","fixes":[{"ecosystem":"PyPI","package":"jupyterlite-core","fixed_in":["0.4.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"jupyterlite-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"jupyterlite-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.1"}]}],"versions":["0.0.0a0","0.1.0","0.1.0a0","0.1.0a1","0.1.0b19","0.1.0b20","0.1.0b21","0.1.0b22","0.1.0rc0","0.1.1","0.1.2","0.1.3","0.2.0","0.2.0a0","0.2.0a1","0.2.0a2","0.2.0a3","0.2.0a4","0.2.0b0","0.2.0b1","0.2.0rc0","0.2.0rc1","0.2.1","0.2.2","0.2.3","0.3.0","0.3.0a0","0.3.0a1","0.3.0b0","0.3.0rc0","0.3.0rc1","0.4.0","0.4.0a0","0.4.0a1","0.4.0a2","0.4.0a3","0.4.0b0","0.4.0b1","0.4.0rc0"]}],"references":[{"url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-9q39-rmj3-p4r2","tags":["web"]},{"url":"https://github.com/jupyterlite/jupyterlite/security/advisories/GHSA-gj55-2xf9-67rq","tags":["web"]},{"url":"https://github.com/advisories/GHSA-gj55-2xf9-67rq"},{"url":"https://github.com/jupyterlite/jupyterlite","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-gj55-2xf9-67rq","title":"HTML injection in JupyterLite leading to DOM Clobbering","description":"### Impact\n\nThe vulnerability depends on user interaction by opening a malicious notebook with Markdown cells, or Markdown file using JupyterLab preview feature.\n\nA malicious user can access any data accessible from JupyterLite and perform arbitrary actions in JupyterLite environment.\n\n### Patches\n\nJupyterLite 0.4.1 was patched.\n\n### Workarounds\n\nThere is no workaround for the underlying DOM Clobbering susceptibility. However, select plugins can be disabled on deployments which cannot update in a timely fashion to minimise the risk. These are:\n- `@jupyterlab/mathjax-extension:plugin` - users will loose ability to preview mathematical equations \n- `@jupyterlab/markdownviewer-extension:plugin` - users will loose ability to open Markdown previews\n- `@jupyterlab/mathjax2-extension:plugin` (if installed with optional `jupyterlab-mathjax2` package) - an older version of the mathjax plugin for JupyterLab 4.x\n\nTo disable these extensions populate the `disabledExtensions` key in `jupyter-config-data` stanza of `jupyter-lite.json` as documented on https://jupyterlite.readthedocs.io/en/stable/howto/configure/config_files.html#jupyter-lite-json\n\n```json\n{\n  \"jupyter-lite-schema-version\": 0,\n  \"jupyter-config-data\": {\n    \"appName\": \"My JupyterLite App\",\n    \"disabledExtensions\": [\n      \"@jupyterlab/markdownviewer-extension:plugin\",\n      \"@jupyterlab/mathjax-extension:plugin\",\n      \"@jupyterlab/mathjax2-extension:plugin\"\n    ]\n  }\n}\n```\n\nTo confirm that the plugins were disabled manual inspection of the built page is required.\n\n### References\n\nUpstream advisory: https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-9q39-rmj3-p4r2\n\n### Notes\n\nThis change has a potential to break rendering of some markdown. There is a setting in Sanitizer which allows to revert to the previous sanitizer settings (`allowNamedProperties`).","status":"published","published":"2024-09-06T19:51:19Z","modified":"2024-11-18T16:27:11Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"medium"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:38:20.012356Z"}],"osv":[{"id":"GHSA-gj55-2xf9-67rq","title":"HTML injection in JupyterLite leading to DOM Clobbering","description":"### Impact\n\nThe vulnerability depends on user interaction by opening a malicious notebook with Markdown cells, or Markdown file using JupyterLab preview feature.\n\nA malicious user can access any data accessible from JupyterLite and perform arbitrary actions in JupyterLite environment.\n\n### Patches\n\nJupyterLite 0.4.1 was patched.\n\n### Workarounds\n\nThere is no workaround for the underlying DOM Clobbering susceptibility. However, select plugins can be disabled on deployments which cannot update in a timely fashion to minimise the risk. These are:\n- `@jupyterlab/mathjax-extension:plugin` - users will loose ability to preview mathematical equations \n- `@jupyterlab/markdownviewer-extension:plugin` - users will loose ability to open Markdown previews\n- `@jupyterlab/mathjax2-extension:plugin` (if installed with optional `jupyterlab-mathjax2` package) - an older version of the mathjax plugin for JupyterLab 4.x\n\nTo disable these extensions populate the `disabledExtensions` key in `jupyter-config-data` stanza of `jupyter-lite.json` as documented on https://jupyterlite.readthedocs.io/en/stable/howto/configure/config_files.html#jupyter-lite-json\n\n```json\n{\n  \"jupyter-lite-schema-version\": 0,\n  \"jupyter-config-data\": {\n    \"appName\": \"My JupyterLite App\",\n    \"disabledExtensions\": [\n      \"@jupyterlab/markdownviewer-extension:plugin\",\n      \"@jupyterlab/mathjax-extension:plugin\",\n      \"@jupyterlab/mathjax2-extension:plugin\"\n    ]\n  }\n}\n```\n\nTo confirm that the plugins were disabled manual inspection of the built page is required.\n\n### References\n\nUpstream advisory: https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-9q39-rmj3-p4r2\n\n### Notes\n\nThis change has a potential to break rendering of some markdown. There is a setting in Sanitizer which allows to revert to the previous sanitizer settings (`allowNamedProperties`).","status":"published","published":"2024-09-06T19:51:19Z","modified":"2024-11-28T05:39:07.411996Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"},{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:47.822182Z"}]}}