Medium severity6.1GHSA Advisory· Published May 5, 2026· Updated May 11, 2026
CVE-2025-61669
CVE-2025-61669
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
jupyter-serverPyPI | < 2.18.0 | 2.18.0 |
Affected products
5- Range: <= 2.17.0
- osv-coords4 versionspkg:apk/chainguard/datahub-ingestionpkg:apk/chainguard/datahub-ingestion-fipspkg:pypi/jupyter-serverpkg:rpm/opensuse/python-jupyter-server&distro=openSUSE%20Tumbleweed
< 1.5.0.4-r0+ 3 more
- (no CPE)range: < 1.5.0.4-r0
- (no CPE)range: < 1.5.0.1-r2
- (no CPE)range: < 2.18.0
- (no CPE)range: < 2.18.1-1.1
Patches
Vulnerability mechanics
References
4- github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653wnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-qh7q-6qm3-653wghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-61669ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2026-67.yamlghsaWEB
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