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CVE-2021-28957

Description

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.


Affected Software


CPE Name Name Version
lxml:lxml lxml 4.6.3
debian:debian_linux debian debian linux 9.0
debian:debian_linux debian debian linux 10.0
fedoraproject:fedora fedoraproject fedora 33
fedoraproject:fedora fedoraproject fedora 34
netapp:snapcenter netapp snapcenter -
oracle:zfs_storage_appliance_kit oracle zfs storage appliance kit 8.8

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