Moderate severityGHSA Advisory· Published Dec 3, 2020· Updated Dec 17, 2025
CVE-2020-27783
CVE-2020-27783
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
lxmlPyPI | < 4.6.2 | 4.6.2 |
Affected products
126- ghsa-coords125 versionspkg:pypi/lxmlpkg:rpm/almalinux/python2-attrspkg:rpm/almalinux/python2-backportspkg:rpm/almalinux/python2-backports-ssl_match_hostnamepkg:rpm/almalinux/python2-chardetpkg:rpm/almalinux/python2-coveragepkg:rpm/almalinux/python2-Cythonpkg:rpm/almalinux/python2-dnspkg:rpm/almalinux/python2-docspkg:rpm/almalinux/python2-docs-infopkg:rpm/almalinux/python2-docutilspkg:rpm/almalinux/python2-funcsigspkg:rpm/almalinux/python2-idnapkg:rpm/almalinux/python2-ipaddresspkg:rpm/almalinux/python2-markupsafepkg:rpm/almalinux/python2-mockpkg:rpm/almalinux/python2-numpypkg:rpm/almalinux/python2-numpy-docpkg:rpm/almalinux/python2-numpy-f2pypkg:rpm/almalinux/python2-pluggypkg:rpm/almalinux/python2-psycopg2pkg:rpm/almalinux/python2-psycopg2-debugpkg:rpm/almalinux/python2-psycopg2-testspkg:rpm/almalinux/python2-pypkg:rpm/almalinux/python2-PyMySQLpkg:rpm/almalinux/python2-pysockspkg:rpm/almalinux/python2-pytestpkg:rpm/almalinux/python2-pytest-mockpkg:rpm/almalinux/python2-pytzpkg:rpm/almalinux/python2-pyyamlpkg:rpm/almalinux/python2-requestspkg:rpm/almalinux/python2-rpm-macrospkg:rpm/almalinux/python2-setuptoolspkg:rpm/almalinux/python2-setuptools_scmpkg:rpm/almalinux/python2-setuptools-wheelpkg:rpm/almalinux/python2-sixpkg:rpm/almalinux/python2-sqlalchemypkg:rpm/almalinux/python2-urllib3pkg:rpm/almalinux/python38-asn1cryptopkg:rpm/almalinux/python38-cffipkg:rpm/almalinux/python38-chardetpkg:rpm/almalinux/python38-cryptographypkg:rpm/almalinux/python38-Cythonpkg:rpm/almalinux/python38-idnapkg:rpm/almalinux/python38-markupsafepkg:rpm/almalinux/python38-mod_wsgipkg:rpm/almalinux/python38-plypkg:rpm/almalinux/python38-psycopg2pkg:rpm/almalinux/python38-psycopg2-docpkg:rpm/almalinux/python38-psycopg2-testspkg:rpm/almalinux/python38-pycparserpkg:rpm/almalinux/python38-PyMySQLpkg:rpm/almalinux/python38-pysockspkg:rpm/almalinux/python38-pytzpkg:rpm/almalinux/python38-requestspkg:rpm/almalinux/python38-scipypkg:rpm/almalinux/python38-sixpkg:rpm/almalinux/python-psycopg2-docpkg:rpm/almalinux/python-sqlalchemy-docpkg:rpm/opensuse/python-lxml&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/ardana-barbican&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/grafana&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/grafana&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-barbican&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-barbican&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-cinder&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-cinder&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-heat-gbp&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-heat-gbp&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-horizon-plugin-gbp-ui&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-horizon-plugin-gbp-ui&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-ironic&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-ironic&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-keystone&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-keystone&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-neutron&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-neutron&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/openstack-neutron-gbp&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/openstack-neutron-gbp&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/python3-lxml&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2012pkg:rpm/suse/python3-lxml&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/python3-lxml&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/python-lxml&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/python-lxml&distro=SUSE%20Enterprise%20Storage%207pkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-ESPOSpkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-LTSSpkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%202%2015%20SP3pkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Real%20Time%2015%20SP2pkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-BCLpkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSSpkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/python-lxml&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP2pkg:rpm/suse/python-lxml&distro=SUSE%20Manager%20Proxy%204.1pkg:rpm/suse/python-lxml&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.1pkg:rpm/suse/python-lxml&distro=SUSE%20Manager%20Server%204.1pkg:rpm/suse/python-lxml&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/python-lxml&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/python-lxml&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/python-lxml&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/python-Pillow&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/python-Pillow&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/python-XStatic-jquery-ui&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/python-XStatic-jquery-ui&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/release-notes-suse-openstack-cloud&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/release-notes-suse-openstack-cloud&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/rubygem-sinatra&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/venv-openstack-barbican&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-cinder&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-designate&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-glance&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-heat&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-horizon&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-ironic&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-keystone&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-magnum&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-manila&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-monasca-ceilometer&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-monasca&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-neutron&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-nova&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-octavia&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-sahara&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/venv-openstack-swift&distro=SUSE%20OpenStack%20Cloud%209
< 4.6.2+ 124 more
- (no CPE)range: < 4.6.2
- (no CPE)range: < 17.4.0-10.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.0-16.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 3.5.0.1-12.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 3.0.4-10.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 4.5.1-4.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 0.28.1-7.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.15.0-10.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.7.16-2.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.7.16-2.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 0.14-12.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.0.2-13.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.5-7.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.0.18-6.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 0.23-19.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.0.0-13.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1:1.14.2-16.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1:1.14.2-16.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1:1.14.2-16.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 0.6.0-8.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.7.5-7.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.7.5-7.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.7.5-7.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.5.3-6.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 0.8.0-10.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.6.8-6.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 3.4.2-13.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.9.0-4.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2017.2-12.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 3.12-16.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 2.20.0-3.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 3-38.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 39.0.1-13.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.15.7-6.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 39.0.1-13.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.11.0-6.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.3.2-2.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.24.2-3.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.2.0-3.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 1.13.2-3.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 3.0.4-19.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.8-3.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 0.29.14-4.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.8-6.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 1.1.1-6.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 4.6.8-3.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 3.11-10.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.8.4-4.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.8.4-4.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.8.4-4.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.19-3.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 0.10.1-1.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 1.7.1-4.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2019.3-3.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.22.0-9.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 1.3.1-4.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 1.12.0-10.module_el8.6.0+2778+cd494b30
- (no CPE)range: < 2.7.5-7.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 1.3.2-2.module_el8.6.0+2781+fed64c13
- (no CPE)range: < 4.0.0-150000.4.3.1
- (no CPE)range: < 9.0+git.1644879908.8a641c1-3.13.1
- (no CPE)range: < 6.7.4-3.26.1
- (no CPE)range: < 6.7.4-3.26.1
- (no CPE)range: < 7.0.1~dev24-3.14.1
- (no CPE)range: < 7.0.1~dev24-3.14.1
- (no CPE)range: < 13.0.10~dev24-3.34.2
- (no CPE)range: < 13.0.10~dev24-3.34.2
- (no CPE)range: < 14.0.1~dev4-3.9.1
- (no CPE)range: < 14.0.1~dev4-3.9.1
- (no CPE)range: < 14.0.1~dev3-3.9.1
- (no CPE)range: < 14.0.1~dev3-3.9.1
- (no CPE)range: < 11.1.5~dev18-3.28.2
- (no CPE)range: < 11.1.5~dev18-3.28.2
- (no CPE)range: < 14.2.1~dev9-3.28.2
- (no CPE)range: < 14.2.1~dev9-3.28.2
- (no CPE)range: < 13.0.8~dev206-3.40.1
- (no CPE)range: < 13.0.8~dev206-3.40.1
- (no CPE)range: < 14.0.1~dev33-3.31.1
- (no CPE)range: < 14.0.1~dev33-3.31.1
- (no CPE)range: < 3.3.5-3.12.1
- (no CPE)range: < 3.6.1-3.3.1
- (no CPE)range: < 3.6.1-3.3.1
- (no CPE)range: < 3.6.1-8.5.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 3.6.1-8.5.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 3.6.1-8.5.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 4.7.1-3.7.1
- (no CPE)range: < 3.6.1-8.5.1
- (no CPE)range: < 4.2.4-3.3.1
- (no CPE)range: < 3.6.1-8.5.1
- (no CPE)range: < 4.2.4-3.3.1
- (no CPE)range: < 5.2.0-3.17.1
- (no CPE)range: < 5.2.0-3.17.1
- (no CPE)range: < 1.13.0.1-4.3.1
- (no CPE)range: < 1.13.0.1-4.3.1
- (no CPE)range: < 9.20220413-3.30.1
- (no CPE)range: < 9.20220413-3.30.1
- (no CPE)range: < 1.4.6-4.3.1
- (no CPE)range: < 7.0.1~dev24-3.35.2
- (no CPE)range: < 13.0.10~dev24-3.38.1
- (no CPE)range: < 7.0.2~dev2-3.35.1
- (no CPE)range: < 17.0.1~dev30-3.33.1
- (no CPE)range: < 11.0.4~dev4-3.35.1
- (no CPE)range: < 14.1.1~dev11-4.39.1
- (no CPE)range: < 11.1.5~dev18-4.33.1
- (no CPE)range: < 14.2.1~dev9-3.36.1
- (no CPE)range: < 7.2.1~dev1-4.35.1
- (no CPE)range: < 7.4.2~dev60-3.41.1
- (no CPE)range: < 1.8.2~dev3-3.35.1
- (no CPE)range: < 2.7.1~dev10-3.37.1
- (no CPE)range: < 13.0.8~dev206-6.39.1
- (no CPE)range: < 18.3.1~dev91-3.39.1
- (no CPE)range: < 3.2.3~dev7-4.35.1
- (no CPE)range: < 9.0.2~dev15-3.35.1
- (no CPE)range: < 2.19.2~dev48-2.30.1
Patches
Vulnerability mechanics
References
19- github.com/advisories/GHSA-pgww-xf46-h92rghsaADVISORY
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK/mitrevendor-advisoryx_refsource_FEDORA
- nvd.nist.gov/vuln/detail/CVE-2020-27783ghsaADVISORY
- www.debian.org/security/2020/dsa-4810ghsavendor-advisoryx_refsource_DEBIANWEB
- advisory.checkmarx.net/advisory/CX-2020-4286ghsax_refsource_MISCWEB
- bugzilla.redhat.com/show_bug.cgighsax_refsource_MISCWEB
- github.com/lxml/lxml/commit/a105ab8dc262ec6735977c25c13f0bdfcdec72a7ghsaWEB
- github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2020-62.yamlghsaWEB
- lists.debian.org/debian-lts-announce/2020/12/msg00028.htmlghsamailing-listx_refsource_MLISTWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQLghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JKghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQLghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JKghsaWEB
- pypi.org/project/lxmlghsaWEB
- security.netapp.com/advisory/ntap-20210521-0003ghsaWEB
- security.netapp.com/advisory/ntap-20210521-0003/mitrex_refsource_CONFIRM
- snyk.io/vuln/SNYK-PYTHON-LXML-1047473ghsaWEB
- www.oracle.com//security-alerts/cpujul2021.htmlghsax_refsource_MISCWEB
News mentions
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