{"id":"UBUNTU-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":"2026-02-04T02:27:19.713922Z","published":"2022-03-25T23:15:00Z","related":["USN-5527-1"],"upstream":["CVE-2021-40906"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-40906"},{"type":"REPORT","url":"https://checkmk.com/werk/13192"},{"type":"REPORT","url":"https://github.com/Edgarloyola/CVE-2021-40906"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5527-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-40906"}],"affected":[{"package":{"name":"check-mk","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/check-mk@1.2.8p16-1ubuntu0.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.8p16-1ubuntu0.2"}]}],"versions":["1.2.8p16-1ubuntu0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.2.8p16-1ubuntu0.2","binary_name":"check-mk-agent"},{"binary_version":"1.2.8p16-1ubuntu0.2","binary_name":"check-mk-agent-logwatch"},{"binary_name":"check-mk-config-icinga","binary_version":"1.2.8p16-1ubuntu0.2"},{"binary_version":"1.2.8p16-1ubuntu0.2","binary_name":"check-mk-livestatus"},{"binary_name":"check-mk-multisite","binary_version":"1.2.8p16-1ubuntu0.2"},{"binary_name":"check-mk-server","binary_version":"1.2.8p16-1ubuntu0.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-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"},{"type":"Ubuntu","score":"medium"}]}