Cross-site Scripting (XSS) Affecting python39-libs package, versions <0:3.9.6-2.module+el8.5.0+12204+54860423


Severity

Recommended
0.0
medium
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.23% (63rd percentile)

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  • Snyk IDSNYK-CENTOS8-PYTHON39LIBS-2130026
  • published26 Jul 2021
  • disclosed21 Mar 2021

Introduced: 21 Mar 2021

CVE-2021-28957  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Centos:8 python39-libs to version 0:3.9.6-2.module+el8.5.0+12204+54860423 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python39-libs package and not the python39-libs package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1