{"id":"CVE-2021-40906","details":"CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication.","modified":"2025-11-14T03:36:05.247196Z","published":"2022-03-25T23:15:08.287Z","references":[{"type":"WEB","url":"http://checkmk.com"},{"type":"ADVISORY","url":"https://github.com/Edgarloyola/CVE-2021-40906"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/checkmk/checkmk","events":[{"introduced":"adf02f46678361844d794effb70eeca27c268548"},{"fixed":"d5ccd5ecc956e665aca80f3c486f7fa46f409424"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-40906.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}