{"id":"CVE-2020-26232","aliases":["GHSA-grfj-wjv9-4f9v","PYSEC-2020-234"],"title":"Open redirect in Jupyter Server","summary":"Open redirect in Jupyter Server","severity":"medium","cvss":4.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","vendor":"jupyter-server","product":"jupyter-server","ecosystem":"pip","affected":["jupyter-server < 1.0.6"],"patched":["jupyter-server 1.0.6"],"published":"2020-11-24","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:48:35.837724184Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-grfj-wjv9-4f9v","references":[{"url":"https://github.com/jupyter/jupyter_server/security/advisories/GHSA-grfj-wjv9-4f9v"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26232"},{"url":"https://github.com/jupyter-server/jupyter_server/commit/3d83e49090289c431da253e2bdb8dc479cbcb157"},{"url":"https://github.com/jupyter-server/jupyter_server"},{"url":"https://github.com/jupyter-server/jupyter_server/blob/master/CHANGELOG.md#106---2020-11-18"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2020-234.yaml"}],"tags":["osv","pip"],"epss":0.01004,"epssPercentile":0.60953,"ingestedAt":"2026-09-12T03:13:01.697Z","slug":"CVE-2020-26232","body":"## Overview\n\n### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nOpen redirect vulnerability - a maliciously crafted link to a jupyter server could redirect the browser to a different website.\n\nAll jupyter servers are technically affected, however, these maliciously crafted links can only be reasonably made for known jupyter server hosts. A link to your jupyter server may *appear* safe, but ultimately redirect to a spoofed server on the public internet.\n\nThis originated in jupyter/notebook: https://github.com/jupyter/notebook/security/advisories/GHSA-c7vm-f5p4-8fqh\n\n### Patches\n\n_Has the problem been patched? What versions should users upgrade to?_\n\njupyter_server 1.0.6\n\n### References\n\n[OWASP page on open redirects](https://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html)\n\n### For more information\n\nIf you have any questions or comments about this advisory, or vulnerabilities to report, please email our security list [security@ipython.org](mailto:security@ipython.org).\n\nCredit: zhuonan li of Alibaba Application Security Team\n\n## Affected packages\n\n- `jupyter-server < 1.0.6`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `jupyter-server 1.0.6`","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":22.5,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}