Detections
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Alpine: multiple py3-lxml packages: security update to 4.6.3-r0

medium Tenable Cloud Security Plugin ID 424398

Description

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

 - An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling
 the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute
 allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS
 code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
 (CVE-2021-28957)

See Also

https://security.alpinelinux.org/vuln/CVE-2021-28957

Plugin Details

Severity: Medium

ID: 424398

Version: Revision 1.8

Type: Local

Published: 4/4/2025

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.4

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

CVSS Score Source: CVE-2021-28957

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 2.1

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 3/21/2021

Reference Information

CVE: CVE-2021-28957