{"id":"CVE-2020-5811","aliases":["GHSA-936x-wgqv-hhgq"],"url":"https://o3.security/vulnerability/CVE-2020-5811","summary":"Authenticated path traversal in Umbraco CMS","details":"An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.","published":"2020-12-30T16:15:12.447Z","modified":"2026-07-08T20:43:18.888817Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":3,"affectedPackages":[{"ecosystem":"NuGet","name":"UmbracoCms","fixedVersion":"8.9.2"}],"fix":null,"references":[{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html"},{"type":"EVIDENCE","url":"https://www.tenable.com/security/research/tra-2020-59"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T20:43:18.888817Z"}}