Detections
Analytics

SCA: security update for jupyter-server (GHSA-fcw5-x6j4-ccmp)

critical Tenable Cloud Security Plugin ID 443494

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in
 jupyter_server render user-authored notebook HTML under the Jupyter origin without a sandbox directive in
 their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default non-sanitizing behavior, a
 notebook carrying an HTML payload in a display_data output triggers stored XSS with cookie access, full
 /api/* authority, and kernel RCE. This vulnerability is fixed in 2.20. (CVE-2026-44727)

Solution

Update the jupyter-server library and its related packages to version 2.20.0 or later.

See Also

https://github.com/advisories/GHSA-fcw5-x6j4-ccmp

Plugin Details

Severity: Critical

ID: 443494

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 6/19/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.53

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

CVSS Score Source: CVE-2026-44727

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 7.4

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/18/2026

Vulnerability Publication Date: 6/18/2026

Reference Information

CVE: CVE-2026-44727