CVE-2021-28957 – lxml

Package

Manager: pip
Name: lxml
Vulnerable Version: >=0 <4.6.3

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

EPSS: 0.00491 pctl0.64613

Details

lxml vulnerable to Cross-Site Scripting An XSS vulnerability was discovered in the python `lxml` clean module versions before 4.6.3. When disabling `the safe_attrs_only` and `forms` arguments, the `Cleaner` class does not remove the `formaction` attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in `lxml` 4.6.3.

Metadata

Created: 2021-03-22T16:53:53Z
Modified: 2024-09-30T16:54:23Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-jq4v-f5q6-mjqq/GHSA-jq4v-f5q6-mjqq.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-jq4v-f5q6-mjqq
Finding: F008
Auto approve: 1