{"id":"CVE-2022-29241","aliases":["GHSA-q874-g24w-4q9g","PYSEC-2022-211"],"url":"https://o3.security/vulnerability/CVE-2022-29241","summary":"Known or guessable hidden files may be accessed in Jupyter Server","details":"Affects: Notebook and Lab between 6.4.0?(potentially earlier) and 6.4.11 (currently latest). Jupyter Server <=1.16.0. If I am correct about the responsible code it will affect Jupyter-Server 1.17.0 and 2.0.0a0 as well.\nDescription: If notebook server is started with a value of `root_dir` that contains the starting user's home directory, then the underlying REST API can be used to leak the access token assigned at start time by guessing/brute forcing the PID of the jupyter server. While this requires an authenticated user session, this url can be used from an xss payload (as in CVE-2021-32798) or from a hooked or otherwise compromised browser to leak this access token to a malicious third party. This token can be used along with the REST API to interact with Jupyter services/notebooks such as modifying or overwriting critical files, such as .bashrc or .ssh/authorized_keys, allowing a malicious user to read potentially sensitive data and possibly gain control of the impacted system.\n","published":"2022-06-14T20:40:15Z","modified":"2026-09-12T03:45:23.594942140Z","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.0093,"percentile":0.58908,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"jupyter-server","fixedVersion":"1.17.1"},{"ecosystem":"PyPI","name":"jupyter-server","fixedVersion":"2.0.0a1"}],"fix":{"url":"https://github.com/jupyter-server/jupyter_server/commit/3485007abbb459585357212dcaa20521989272e8","label":"jupyter-server/jupyter_server@3485007"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/29xxx/CVE-2022-29241.json"},{"type":"ADVISORY","url":"https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-q874-g24w-4q9g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-29241"},{"type":"WEB","url":"https://github.com/jupyter-server/jupyter_server/commit/3485007abbb459585357212dcaa20521989272e8"},{"type":"WEB","url":"https://github.com/jupyter-server/jupyter_server/commit/877da10cd0d7ae45f8b1e385fa1f5a335e7adf1f"},{"type":"PACKAGE","url":"https://github.com/jupyter-server/jupyter_server"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2022-211.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-12T03:45:23.594942140Z"}}