{"id":"CVE-2020-18703","aliases":["EUVD-2021-0218","GHSA-3xg5-6c3j-vp8x","PYSEC-2021-144"],"status":"published","title":"Improper Restriction of XML External Entity Reference in Quokka","description":"XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.02771,"percentile":0.86524,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-611"],"published":"2021-08-16T17:55:55Z","modified":"2026-10-20T10:52:03Z","affected":[{"source":"ghsa","ecosystem":"PyPI","package":"quokka","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.4.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"quokka","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.4.0"}]}],"versions":["0.0.1.dev84","0.1.0","0.2.0","0.3.0","0.3.1","0.3.2","0.3.3","0.3.4","0.3.6.dev1","0.3.7.dev1","0.4.0"]},{"source":"osv","ecosystem":"PyPI","package":"quokka","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.1.dev84","0.1.0","0.2.0","0.3.0","0.3.1","0.3.2","0.3.3","0.3.4","0.3.6.dev1","0.3.7.dev1","0.4.0","0.4.1.dev22","0.4.1.dev6"]}],"products":[{"vendor":"quokka_project","product":"quokka"}],"references":[{"url":"https://github.com/rochacbruno/quokka/issues/676","tags":["x_refsource_MISC","x_transferred","Exploit","Patch","Third Party Advisory","fix","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-18703","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/quokka/PYSEC-2021-144.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3xg5-6c3j-vp8x","tags":["advisory"]},{"url":"https://github.com/quokkaproject/quokka","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2020-18703","description":"XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.","status":"published","published":"2021-08-16T17:55:55Z","modified":"2024-08-04T14:08:29.757Z","updated_at":"2026-11-02T14:35:59.434367Z"}],"euvd":[{"id":"EUVD-2021-0218","description":"XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.","status":"published","published":"2021-08-16T17:55:55Z","modified":"2024-08-04T14:08:29Z","updated_at":"2026-11-03T03:07:26.397496Z"}],"ghsa":[{"id":"GHSA-3xg5-6c3j-vp8x","title":"Improper Restriction of XML External Entity Reference in Quokka","description":"XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.","status":"published","published":"2021-08-30T16:23:34Z","modified":"2024-10-16T21:28:23Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-611"],"updated_at":"2026-11-02T14:38:11.479492Z"}],"nvd":[{"id":"CVE-2020-18703","description":"XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.","status":"published","published":"2021-08-16T18:15:07.17Z","modified":"2026-06-17T02:59:25.35Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-611"],"updated_at":"2026-11-02T14:06:44.292752Z"}],"osv":[{"id":"CVE-2020-18703","description":"XML External Entities (XXE) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the component 'quokka/utils/atom.py'.","status":"published","published":"2021-08-16T18:15:07.17Z","modified":"2026-10-20T10:52:03.70566295Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:15.212689Z"},{"id":"GHSA-3xg5-6c3j-vp8x","title":"Improper Restriction of XML External Entity Reference in Quokka","description":"XML External 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