CVE-2021-28957

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.

Link	Resource
https://bugs.launchpad.net/lxml/+bug/1888153	Exploit Issue Tracking
https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270	Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html	Mailing List Third Party Advisory
https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999	Patch Third Party Advisory
https://www.debian.org/security/2021/dsa-4880	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210521-0004/	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ/	Mailing List Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html	Patch Third Party Advisory
https://security.gentoo.org/glsa/202208-06	Third Party Advisory

Configuration 1

cpe:2.3:a:lxml:lxml:*:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:* cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*

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Published : 2021-03-21 05:15

Updated : 2022-12-09 06:15

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NVD link : CVE-2021-28957

Mitre link : CVE-2021-28957

No products.

CWE-79