{"cve":"CVE-2025-61669","nvd":{"published":"2026-05-05T16:16:10.133","modified":"2026-10-07T09:10:00.160","status":"Analyzed","description":"Jupyter Server is the backend for Jupyter web applications. In jupyter_server versions through 2.17.0, the next query parameter in the login flow is insufficiently validated in `LoginFormHandler._redirect_safe()`, which allows redirects to arbitrary external domains via values such as `///example.com`. An attacker can use a crafted login URL to redirect users to a malicious site and facilitate phishing attacks. This issue is fixed in version 2.18.0.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-601"],"references":["https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w","https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w"],"products":["jupyter:jupyter_server"],"source":"nvd","synced_at":"2026-10-19T22:33:55.586217763+00:00"},"epss":{"cve":"CVE-2025-61669","score":0.00244,"percentile":0.15426,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-qh7q-6qm3-653w","url":"https://osv.dev/vulnerability/GHSA-qh7q-6qm3-653w","summary":"Jupyter Server has an open redirection vulnerability in `next` query parameter","modified":"2026-09-10T03:50:47.272631530Z","packages":[{"ecosystem":"PyPI","name":"jupyter-server","purl":"pkg:pypi/jupyter-server","ranges":["<2.18.0"],"fixed":["2.18.0"]}]},{"id":"PYSEC-2026-67","url":"https://osv.dev/vulnerability/PYSEC-2026-67","summary":"","modified":"2026-05-20T09:19:02.865171Z","packages":[{"ecosystem":"PyPI","name":"jupyter-server","purl":"pkg:pypi/jupyter-server","ranges":["<2.18.0"],"fixed":["2.18.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}