{"id":"CVE-2020-26261","aliases":["EUVD-2020-0093","GHSA-cg54-gpgr-4rm6","PYSEC-2020-52"],"status":"published","title":"user-readable api tokens in systemd units","description":"jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15","severity":{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0048,"percentile":0.41729,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-668"],"published":"2020-12-09T16:27:43Z","modified":"2026-10-20T10:52:56Z","fixes":[{"ecosystem":"PyPI","package":"jupyterhub-systemdspawner","fixed_in":["0.15.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"jupyterhub-systemdspawner","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.15.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"jupyterhub-systemdspawner","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.15.0"}]}],"versions":["0.10","0.11","0.12","0.13","0.14","0.9","0.9.1","0.9.10","0.9.11","0.9.12","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9"]},{"source":"osv","ecosystem":"PyPI","package":"jupyterhub-systemdspawner","ranges":[{"type":"GIT","events":[{"introduced":"0"},{"fixed":"a4d08fd2ade1cfd0ef2c29dc221e649345f23580"}]},{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.15.0"}]}],"versions":["0.9","0.9.1","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9","0.9.10","0.9.11","0.9.12","0.10","0.11","0.12","0.13","0.14"]}],"products":[{"vendor":"jupyterhub","product":"systemdspawner"}],"references":[{"url":"https://github.com/jupyterhub/systemdspawner/security/advisories/GHSA-cg54-gpgr-4rm6","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/jupyterhub/systemdspawner/commit/a4d08fd2ade1cfd0ef2c29dc221e649345f23580","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/jupyterhub/systemdspawner/blob/master/CHANGELOG.md#v015","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory","web"]},{"url":"https://pypi.org/project/jupyterhub-systemdspawner/","tags":["x_refsource_MISC","x_transferred","Product","Third Party Advisory","package"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26261","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-systemdspawner/PYSEC-2020-52.yaml","tags":["web"]},{"url":"https://pypi.org/project/jupyterhub-systemdspawner","tags":["web"]},{"url":"https://github.com/advisories/GHSA-cg54-gpgr-4rm6"},{"url":"https://github.com/jupyterhub/systemdspawner","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2020-26261","title":"user-readable api tokens in systemd units","description":"jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15","status":"published","published":"2020-12-09T16:30:14Z","modified":"2024-08-04T15:56:03.813Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-668"],"updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2020-0093","description":"jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15","status":"published","published":"2020-12-09T16:30:14Z","modified":"2024-08-04T15:56:03Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T03:07:15.778249Z"}],"ghsa":[{"id":"GHSA-cg54-gpgr-4rm6","title":"user-readable api tokens in systemd units for JupyterHub","description":"### Impact\nuser API tokens issued to single-user servers are specified in the environment of systemd units, which are accessible to all users.\n\nIn particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default.\n\n### Patches\nPatched in jupyterhub-systemdspawner v0.15\n\n### Workarounds\nNo workaround other than upgrading systemdspawner to 0.15\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open a thread in [the Jupyter forum](https://discourse.jupyter.org)\n* Email us at [security@ipython.org](mailto:security@ipython.org)","status":"published","published":"2020-12-09T16:27:43Z","modified":"2024-09-27T15:38:38Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U","level":"high"},{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-668"],"updated_at":"2026-11-02T14:38:06.988799Z"}],"nvd":[{"id":"CVE-2020-26261","description":"jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15","status":"published","published":"2020-12-09T17:15:30.603Z","modified":"2026-06-17T03:07:56.837Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":3.3,"vector":"AV:L/AC:M/Au:N/C:P/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-668"],"updated_at":"2026-11-02T14:06:27.10541Z"}],"osv":[{"id":"CVE-2020-26261","description":"jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15","status":"published","published":"2020-12-09T17:15:30.603Z","modified":"2026-10-20T10:52:56.586518809Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"GHSA-cg54-gpgr-4rm6","title":"user-readable api tokens in systemd units for JupyterHub","description":"### Impact\nuser API tokens issued to single-user servers are specified in the environment of systemd units, which are accessible to all users.\n\nIn particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default.\n\n### Patches\nPatched in jupyterhub-systemdspawner v0.15\n\n### Workarounds\nNo workaround other than upgrading systemdspawner to 0.15\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open a thread in [the Jupyter forum](https://discourse.jupyter.org)\n* Email us at [security@ipython.org](mailto:security@ipython.org)","status":"published","published":"2020-12-09T16:27:43Z","modified":"2026-09-10T03:49:00.478208411Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"},{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U","level":"high"}],"cwes":["CWE-668"],"updated_at":"2026-11-02T15:46:44.927642Z"},{"id":"PYSEC-2020-52","description":"jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15","status":"published","published":"2020-12-09T17:15:00Z","modified":"2023-11-08T04:03:16.807176Z","updated_at":"2026-11-02T15:52:52.682031Z"}]}}