GHSA-jq4v-f5q6-mjqq
lxml vulnerable to Cross-Site Scripting
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
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
External links from the advisory. They lead to third-party sites.
- 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