CVE-2025-61669CWE-601

CVE-2025-61669

Medium · published May 5, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
14.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00244 · 14.7th percentile
Weakness
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
Published
2026-05-05T20:16Z
Affected products (1)
ProductVersionsFixed in
jupyter/jupyter_server< 2.18.02.18.0
References (2)
https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w · [email protected]https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 05 MAY 15:28Z
    jupyter_server next parameter open redirect can redirect users to external domains
    cvelistv5