CyberRota Analysis
AI-GeneratedJupyter Server versions prior to 2.21.0 are vulnerable due to improper handling of the Referer header in 5xx request logging, which can lead to sensitive token exposure in plaintext within server logs. This vulnerability allows an attacker with log access to retrieve user tokens and potentially exploit the affected user's permissions on the Jupyter Server. Organizations using Jupyter Server should prioritize upgrading to version 2.21.0 or later to mitigate this risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
Note: these links are listed for security research and verification purposes only.
Original NVD Description
Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyter_server/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the Referer contains a token-bearing URL can therefore write that token to server logs in plaintext. An attacker who can read those logs can recover the token and use the affected user's Jupyter Server permissions. This issue is fixed in version 2.21.0.