CVE-2020-27783

MEDIUM

lxml < 4.6.2 - Cross-Site Scripting via Clean Module Parser

Title source: llm
STIX 2.1

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.

References (8)

Core 8
Core References
Exploit, Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1901633
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2020/dsa-4810
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/12/msg00028.html
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com//security-alerts/cpujul2021.html
Exploit, Third Party Advisory x_refsource_misc
https://advisory.checkmarx.net/advisory/CX-2020-4286
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210521-0003/

Scores

CVSS v3 6.1
EPSS 0.0125
EPSS Percentile 79.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (11)
debian/debian_linux 9.0
debian/debian_linux 10.0
fedoraproject/fedora 32
fedoraproject/fedora 33
lxml/lxml 1.2 - 4.6.2
netapp/snapcenter
oracle/communications_offline_mediation_controller 12.0.0.3.0
oracle/zfs_storage_appliance_kit 8.8
pypi/lxml 0 - 4.6.2PyPI
redhat/enterprise_linux 8.0
... and 1 more
Published Dec 03, 2020
Tracked Since Feb 18, 2026