CVE-2020-27783

Aliases:GHSA-pgww-xf46-h92rPYSEC-2020-62
Advisory lineage Upstream: 0 Downstream: 19
Modified
Published: 03 Dec 2020, 16:39
Last modified:17 Dec 2025, 21:02

Vulnerability Summary

Overall Risk (default)
medium
35/100
CVSS Score
6.1 MEDIUM
v3.1 (cve.org)
EPSS Score
1.25% LOW
1% probability +0.11%
KEV
Not listed
Ransomware
No reports
Public exploits
2 found
Dark Web
Not detected

Timeline

03 Dec 2020, 16:39
Published
Vulnerability first disclosed
17 Dec 2025, 21:02
Last Modified
Vulnerability information updated

Description

A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.

CVSS Metrics

  • v4.0•MEDIUM•Score: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
  • v3.1•MEDIUM•Score: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
  • v2.0•MEDIUM•Score: 4.3AV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS Trends

Current EPSS score: 1.25%• Percentile: 80%

Techniques & Countermeasures

  • CWE-79•Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

    The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Affected Systems

  • debian•debian_linux

    9.0 | 10.0

  • fedoraproject•fedora

    32 | 33

  • lxml•lxml

    ≥ 1.2, < 4.6.2

  • netapp•snapcenter

    na

  • oracle•communications_offline_mediation_controller

    12.0.0.3.0

  • oracle•zfs_storage_appliance_kit

    8.8

  • PyPI•lxml

    < 4.6.2 | ≥ 1.2, < 4.6.2

  • redhat•enterprise_linux

    8.0

  • redhat•software_collections

    na

References (22)