SB2026090362 - Fedora 43 update for python-jupyter-server

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Main Vulnerability Database SB2026090362

SB2026090362 - Fedora 43 update for python-jupyter-server

Published: September 3, 2026

Security Bulletin ID SB2026090362
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Cross-site scripting (CVE-ID: CVE-2026-44727)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]


The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to cross-site scripting in NbconvertFileHandler and NbconvertPostHandler when rendering user-authored notebook HTML under the Jupyter origin without a sandbox directive in the Content-Security-Policy. A local user can place crafted HTML payloads in a notebook display_data output to execute arbitrary code.

User interaction is required because an authenticated victim must navigate to a /nbconvert/html/<path> view containing attacker-authored output.


Remediation

Install update from vendor's website.

References