GHSA-jq4v-f5q6-mjqq

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GHSA-jq4v-f5q6-mjqq

Summary: lxml vulnerable to Cross-Site Scripting

Details: 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.

References: https://nvd.nist.gov/vuln/detail/CVE-2021-28957, https://github.com/lxml/lxml/pull/316, https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270, https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d, https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999, https://www.oracle.com/security-alerts/cpuoct2021.html, https://www.debian.org/security/2021/dsa-4880, https://security.netapp.com/advisory/ntap-20210521-0004, https://security.gentoo.org/glsa/202208-06, https://pypi.org/project/lxml, https://lists.fedoraproject.org/archives/list/[email protected]/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ, https://lists.fedoraproject.org/archives/list/[email protected]/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45, https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html, https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml, https://github.com/lxml/lxml, https://github.com/advisories/GHSA-jq4v-f5q6-mjqq, https://bugs.launchpad.net/lxml/+bug/1888153