Detections
Analytics

SCA: security update for flask-unchained (GHSA-pjc4-3w99-j7v4)

medium Tenable Cloud Security Plugin ID 417565

Description

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

 - This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_url function,
 it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back
 slashes such as \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server
 other than Werkzeug is used, or the default behaviour of Werkzeug is modified using
 'autocorrect_location_header=False. (CVE-2021-23393)

See Also

https://github.com/advisories/GHSA-pjc4-3w99-j7v4

Plugin Details

Severity: Medium

ID: 417565

Version: Revision 1.6

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: Low

Score: 2.1

Percentile: 6.91

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2021-23393

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.7

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/15/2021

Vulnerability Publication Date: 6/10/2021

Reference Information

CVE: CVE-2021-23393

cwe: CWE-601