Detections
Analytics

SCA: security update for jupyterhub-firstuseauthenticator (GHSA-5xvc-vgmp-jgc3)

critical Tenable Cloud Security Plugin ID 411095

Description

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

 - FirstUseAuthenticator is a JupyterHub authenticator that helps new users set their password on their first
 login to JupyterHub. When JupyterHub is used with FirstUseAuthenticator, a vulnerability in versions prior
 to 1.0.0 allows unauthorized access to any user's account if `create_users=True` and the username is known
 or guessed. One may upgrade to version 1.0.0 or apply a patch manually to mitigate the vulnerability. For
 those who cannot upgrade, there is no complete workaround, but a partial mitigation exists. One can
 disable user creation with `c.FirstUseAuthenticator.create_users = False`, which will only allow login
 with fully normalized usernames for already existing users prior to jupyterhub-firstuserauthenticator
 1.0.0. If any users have never logged in with their normalized username (i.e. lowercase), they will still
 be vulnerable until a patch or upgrade occurs. (CVE-2021-41194)

See Also

https://github.com/advisories/GHSA-5xvc-vgmp-jgc3

Plugin Details

Severity: Critical

ID: 411095

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 1/23/2025

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2021-41194

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/28/2021

Vulnerability Publication Date: 10/28/2021

Reference Information

CVE: CVE-2021-41194

cwe: CWE-284