—
PYSEC-2021-19
Quick fix
PYSEC-2021-19 — lxml: upgrade to the fixed version with the command below.
pip install --upgrade 'lxml>=a5f9cb52079dc57477c460dbe6ba0f775e14a999'Details
An XSS vulnerability was discovered in python-lxml's 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.
Are you affected?
Enter the version of the package you're using.
Affected packages
PyPI/lxml
Introduced in:
0Fixed in: a5f9cb52079dc57477c460dbe6ba0f775e14a999Fix
pip install --upgrade 'lxml>=a5f9cb52079dc57477c460dbe6ba0f775e14a999'References
- https://bugs.launchpad.net/lxml/+bug/1888153[WEB]
- https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270[WEB]
- https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html[WEB]
- https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999[FIX]
- https://www.debian.org/security/2021/dsa-4880[ADVISORY]
- https://github.com/advisories/GHSA-jq4v-f5q6-mjqq[ADVISORY]