VULNERABILITY INTELLIGENCE

CVE-2025-61669

CVSS score6.1 MEDIUM
EPSS probability0.24%
CISA KEVNot currently listed
Published2026-05-05
Last modified2026-10-07
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-601

Primary references