CVEvulnerability

CVE-2026-86049

7.1 HIGH Published 2026-09-17 Modified 2026-09-24 Official page ↗
Status
Awaiting Analysis
Published
2026-09-17
Last modified
2026-09-24
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.1 HIGH — CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Weaknesses
CWE-532

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.

Related

Weakness · CWE (1)

  • CWE-532 Insertion of Sensitive Information into Log File weakness

References