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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-28957US | medium6.1 | — | ||
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 t… | ||||
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references
External citations — patches, advisories, analysis.
- https://bugs.launchpad.net/lxml/+bug/1888153WEB
- https://github.com/advisories/GHSA-jq4v-f5q6-mjqqADVISORY
- https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999FIX
- https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270WEB
- https://lists.debian.org/debian-lts-announce/2021/03/msg00031.htmlWEB
- https://www.debian.org/security/2021/dsa-4880ADVISORY
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