GHSA-jq4v-f5q6-mjqq
lxml vulnerable to Cross-Site Scripting
At a glance
- Published
- Updated
- CVE
- CVE-2021-28957
- Aliases
- PYSEC-2021-19
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Description
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.
Affected packages
| Package | Versions |
|---|---|
| PyPI · lxml | introduced 0, fixed 4.6.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-28957 ADVISORY
- https://github.com/lxml/lxml/pull/316 WEB
- https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270 WEB
- https://github.com/lxml/lxml/commit/2d01a1ba8984e0483ce6619b972832377f208a0d WEB
- https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999 WEB
- https://www.oracle.com/security-alerts/cpuoct2021.html WEB
- https://www.debian.org/security/2021/dsa-4880 WEB
- https://security.netapp.com/advisory/ntap-20210521-0004 WEB
- https://security.gentoo.org/glsa/202208-06 WEB
- https://pypi.org/project/lxml WEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XXN3QPWCTQVOGW4BMWV3AUUZZ4NRZNSQ WEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3C2R44VDUY7FJVMAVRZ2WY7XYL4SVN45 WEB
- https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html WEB
- https://github.com/pypa/advisory-database/tree/main/vulns/lxml/PYSEC-2021-19.yaml WEB
- https://github.com/lxml/lxml PACKAGE
- https://github.com/advisories/GHSA-jq4v-f5q6-mjqq ADVISORY
- https://bugs.launchpad.net/lxml/+bug/1888153 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |