{"id":"CVE-2025-61669","aliases":["GHSA-qh7q-6qm3-653w","PYSEC-2026-67"],"url":"https://o3.security/vulnerability/CVE-2025-61669","summary":"jupyter_server next parameter open redirect can redirect users to external domains","details":"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.","published":"2026-05-05T15:28:43.833Z","modified":"2026-09-12T03:45:33.537406610Z","cvss":null,"epss":{"score":0.00265,"percentile":0.18615,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"jupyter-server","fixedVersion":"2.18.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61669.json"},{"type":"ADVISORY","url":"https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61669"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-12T03:45:33.537406610Z"}}