{"id":"CVE-2021-28931","aliases":["GHSA-748f-wv76-x9hg"],"url":"https://o3.security/vulnerability/CVE-2021-28931","summary":"Arbitrary file upload in Fork CMS","details":"Arbitrary file upload vulnerability in Fork CMS 5.9.2 allows attackers to create or replace arbitrary files in the /themes directory via a crafted zip file uploaded to the Themes panel.","published":"2021-07-07T15:15:08.120Z","modified":"2026-07-08T21:26:33.883616Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"forkcms/forkcms","fixedVersion":"5.9.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/bousalman/ForkCMS-arbitrary-upload/blob/main/README.md"},{"type":"ADVISORY","url":"https://github.com/forkcms/forkcms/releases/tag/5.9.2"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T21:26:33.883616Z"}}