{"id":"CVE-2026-28350","aliases":["GHSA-xvp8-3mhv-424c","PYSEC-2026-2202"],"url":"https://o3.security/vulnerability/CVE-2026-28350","summary":"lxml_html_clean: <base> tag injection through default Cleaner configuration","details":"lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4.","published":"2026-03-05T19:49:55.662Z","modified":"2026-08-12T03:51:38.994510589Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"lxml-html-clean","fixedVersion":"0.4.4"}],"fix":{"url":"https://github.com/fedora-python/lxml_html_clean/commit/9c5612ca33b941eec4178abf8a5294b103403f34","label":"fedora-python/lxml_html_clean@9c5612c"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28350.json"},{"type":"ADVISORY","url":"https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-xvp8-3mhv-424c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28350"},{"type":"FIX","url":"https://github.com/fedora-python/lxml_html_clean/commit/9c5612ca33b941eec4178abf8a5294b103403f34"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:38.994510589Z"}}