PYSEC-2021-19
At a glance
- Published
- Updated
- CVE
- CVE-2021-28957
- Aliases
- GHSA-jq4v-f5q6-mjqq
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 packages
| Package | Versions |
|---|---|
| PyPI · lxml | introduced 0, fixed a5f9cb52079dc57477c460dbe6ba0f775e14a999 ; introduced 0, fixed 4.6.3 |
References
- https://bugs.launchpad.net/lxml/+bug/1888153 WEB
- https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270 WEB
- https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html WEB
- https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999 FIX
- https://www.debian.org/security/2021/dsa-4880 ADVISORY
- https://github.com/advisories/GHSA-jq4v-f5q6-mjqq ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |