{"id":"CVE-2020-26261","aliases":["GHSA-cg54-gpgr-4rm6","PYSEC-2020-52"],"title":"user-readable api tokens in systemd units for JupyterHub","summary":"user-readable api tokens in systemd units for JupyterHub","severity":"high","cvss":7.9,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","vendor":"jupyterhub-systemdspawner","product":"jupyterhub-systemdspawner","ecosystem":"pip","affected":["jupyterhub-systemdspawner < 0.15.0"],"patched":["jupyterhub-systemdspawner 0.15.0"],"published":"2020-12-09","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:00.478208411Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-cg54-gpgr-4rm6","references":[{"url":"https://github.com/jupyterhub/systemdspawner/security/advisories/GHSA-cg54-gpgr-4rm6"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26261"},{"url":"https://github.com/jupyterhub/systemdspawner/commit/a4d08fd2ade1cfd0ef2c29dc221e649345f23580"},{"url":"https://github.com/jupyterhub/systemdspawner"},{"url":"https://github.com/jupyterhub/systemdspawner/blob/master/CHANGELOG.md#v015"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-systemdspawner/PYSEC-2020-52.yaml"},{"url":"https://pypi.org/project/jupyterhub-systemdspawner"}],"tags":["osv","pip"],"epss":0.0048,"epssPercentile":0.40595,"ingestedAt":"2026-09-12T03:13:01.687Z","slug":"CVE-2020-26261","body":"## Overview\n\n### 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)\n\n## Affected packages\n\n- `jupyterhub-systemdspawner < 0.15.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `jupyterhub-systemdspawner 0.15.0`","depth":"twilight","depthScore":44,"depthScoreParts":{"impact":43.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}