{"id":"CVE-2024-28233","aliases":["BIT-jupyterhub-2024-28233","GHSA-7r3h-4ph8-w38g","PYSEC-2026-1480"],"url":"https://o3.security/vulnerability/CVE-2024-28233","summary":"XSS in JupyterHub via Self-XSS leveraged by Cookie Tossing","details":"### Impact\n\nAffected configurations:\n\n- Single-origin JupyterHub deployments\n- JupyterHub deployments with user-controlled applications running on subdomains or peer subdomains of either the Hub or a single-user server.\n\nBy tricking a user into visiting a malicious subdomain, the attacker can achieve an XSS directly affecting the former's session. More precisely, in the context of JupyterHub, this XSS could achieve the following:\n\n- Full access to JupyterHub API and user's single-user server, e.g.\n  - Create and exfiltrate an API Token\n  - Exfiltrate all files hosted on the user's single-user server: notebooks, images, etc.\n  - Install malicious extensions. They can be used as a backdoor to silently regain access to victim's session anytime.\n\n### Patches\n\nTo prevent cookie-tossing:\n\n- Upgrade to JupyterHub 4.1 (both hub and user environment)\n- enable per-user domains via `c.JupyterHub.subdomain_host = \"https://mydomain.example.org\"`\n- set `c.JupyterHub.cookie_host_prefix_enabled = True` to enable domain-locked cookies\n\nor, if available (applies to earlier JupyterHub versions):\n\n- deploy jupyterhub on its own domain, not shared with any other services\n- enable per-user domains via `c.JupyterHub.subdomain_host = \"https://mydomain.example.org\"`","published":"2024-03-27T18:16:24.308Z","modified":"2026-08-12T03:51:38.155090001Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"},"epss":{"score":0.00329,"percentile":0.25918,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"jupyterhub","fixedVersion":"4.1.0"}],"fix":{"url":"https://github.com/jupyterhub/jupyterhub/commit/e2798a088f5ad45340fe79cdf1386198e664f77f","label":"jupyterhub/jupyterhub@e2798a0"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/28xxx/CVE-2024-28233.json"},{"type":"ADVISORY","url":"https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-7r3h-4ph8-w38g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-28233"},{"type":"FIX","url":"https://github.com/jupyterhub/jupyterhub/commit/e2798a088f5ad45340fe79cdf1386198e664f77f"},{"type":"PACKAGE","url":"https://github.com/jupyterhub/jupyterhub"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:38.155090001Z"}}