{"id":"CVE-2020-7245","details":"Incorrect username validation in the registration process of CTFd v2.0.0 - v2.2.2 allows an attacker to take over an arbitrary account if the username is known and emails are enabled on the CTFd instance. To exploit the vulnerability, one must register with a username identical to the victim's username, but with white space inserted before and/or after the username. This will register the account with the same username as the victim. After initiating a password reset for the new account, CTFd will reset the victim's account password due to the username collision.","modified":"2026-03-14T14:48:18.278109Z","published":"2020-01-23T23:15:11.597Z","references":[{"type":"ADVISORY","url":"https://github.com/CTFd/CTFd/pull/1218"},{"type":"ADVISORY","url":"https://github.com/CTFd/CTFd/releases/tag/2.2.3"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ctfd/ctfd","events":[{"introduced":"809e4df4719fa63841ff3f28175f9a09da31963a"},{"last_affected":"fe85fdf1e5561e9f04c1c80c72e894dcd7ea3ad7"},{"fixed":"d59bfa3578b0e5ac8dd3570038d123014372a81c"}],"database_specific":{"versions":[{"introduced":"2.0.0"},{"last_affected":"2.2.2"}]}}],"versions":["2.0.0","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.1.0","2.1.1","2.1.2","2.1.3","2.1.4","2.1.5","2.2.0","2.2.1","2.2.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7245.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}