{"cve":"CVE-2020-27783","nvd":{"published":"2020-12-03T17:15:13.177","modified":"2026-06-17T03:09:38.167","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://advisory.checkmarx.net/advisory/CX-2020-4286","https://bugzilla.redhat.com/show_bug.cgi?id=1901633","https://lists.debian.org/debian-lts-announce/2020/12/msg00028.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK/"],"products":["debian:debian_linux","fedoraproject:fedora","lxml:lxml","netapp:snapcenter","oracle:communications_offline_mediation_controller","oracle:zfs_storage_appliance_kit","redhat:enterprise_linux","redhat:software_collections"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-27783","score":0.03982,"percentile":0.90493,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-pgww-xf46-h92r","url":"https://osv.dev/vulnerability/GHSA-pgww-xf46-h92r","summary":"lxml vulnerable to Cross-site Scripting","modified":"2025-12-20T05:25:57.674445Z","packages":[{"ecosystem":"PyPI","name":"lxml","purl":"pkg:pypi/lxml","ranges":["<4.6.2"],"fixed":["4.6.2"]}]},{"id":"PYSEC-2020-62","url":"https://osv.dev/vulnerability/PYSEC-2020-62","summary":"","modified":"2023-11-08T04:03:22.239924Z","packages":[{"ecosystem":"PyPI","name":"lxml","purl":"pkg:pypi/lxml","ranges":[">=1.2 <4.6.2"],"fixed":["4.6.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}