medium6.1
CVE-2025-61669
Jupyter Server has an open redirection vulnerability in `next` query parameter
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | jupyter-server | <= 2.17.0 | 2.18.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Jupyter | Jupyter Server | before 2.18.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-qh7q-6qm3-653w
- https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w
- https://nvd.nist.gov/vuln/detail/CVE-2025-61669
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2026-67.yaml