{"id":"CVE-2020-18703","aliases":["GHSA-3xg5-6c3j-vp8x","PYSEC-2021-144"],"url":"https://o3.security/vulnerability/CVE-2020-18703","summary":"Improper Restriction of XML External Entity Reference in Quokka","details":"XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.","published":"2021-08-16T18:15:07.170Z","modified":"2026-07-08T20:28:53.892702Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"PyPI","name":"quokka","fixedVersion":null}],"fix":null,"references":[{"type":"FIX","url":"https://github.com/rochacbruno/quokka/issues/676"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T20:28:53.892702Z"}}