CVSS 3.1
6.1 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NCVE-2020-27783
Medium (6.1). EPSS 4.0% chance of exploitation in the next 30 days. Fixed in lxml 4.6.2.
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.
Severity
- EPSS
- 4.0% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- 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
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-pgww-xf46-h92r | PyPI | lxml | <4.6.2 | 4.6.2 |
| PYSEC-2020-62 | PyPI | lxml | >=1.2 <4.6.2 | 4.6.2 |
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/