{"id":"CVE-2026-9549","summary":"Fix XSS in service discovery active check output","details":"Stored cross-site scripting in the service discovery active check output in Checkmk \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48, and all 2.2.0 versions allows an administrator who can configure active or custom checks to inject malicious HTML or JavaScript into check output that executes in the browser of an admin or a user with host read permissions when they run the check on the service discovery page.","modified":"2026-10-28T02:30:29.899307431Z","published":"2026-06-08T12:07:12.356Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9549.json","unresolved_ranges":[{"extracted_events":[{"strategy":"StandaloneSingleVersion","range":[{"introduced":"2.2.0"},{"last_affected":"2.2.0"}],"source":"AFFECTED_FIELD"}]},{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"2.5.0"},{"fixed":"2.5.0p5"},{"introduced":"2.4.0"},{"fixed":"2.4.0p31"},{"introduced":"2.3.0"},{"fixed":"2.3.0p48"}],"source":"AFFECTED_FIELD"}]}],"cna_assigner":"Checkmk","cwe_ids":["CWE-79"]},"references":[{"type":"ADVISORY","url":"https://checkmk.com/werk/17993"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9549.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9549"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/checkmk/checkmk","events":[{"introduced":"d6049cd2d82eba3842b30c305912b9e946842463"},{"last_affected":"4488bab2392314ec74c09ecde1f09187dcedf2b3"}],"database_specific":{"extracted_events":[{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:-:*:*:*:*:*:*","range":[{"introduced":"2.2.0-NA"},{"last_affected":"2.2.0-NA"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b1:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b1"},{"last_affected":"2.2.0-b1"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:i1:*:*:*:*:*:*","range":[{"introduced":"2.2.0-i1"},{"last_affected":"2.2.0-i1"}],"source":"CPE_STRING"},{"range":[{"introduced":"2.2.0-p1"},{"last_affected":"2.2.0-p1"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p1:*:*:*:*:*:*"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b2:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b2"},{"last_affected":"2.2.0-b2"}]},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p2:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p2"},{"last_affected":"2.2.0-p2"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b3:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b3"},{"last_affected":"2.2.0-b3"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p3:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p3"},{"last_affected":"2.2.0-p3"}],"source":"CPE_STRING"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b4:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b4"},{"last_affected":"2.2.0-b4"}]},{"range":[{"introduced":"2.2.0-p4"},{"last_affected":"2.2.0-p4"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p4:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b5:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b5"},{"last_affected":"2.2.0-b5"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p5:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p5"},{"last_affected":"2.2.0-p5"}],"source":"CPE_STRING"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b6:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b6"},{"last_affected":"2.2.0-b6"}]},{"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p6:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p6"},{"last_affected":"2.2.0-p6"}]},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b7:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b7"},{"last_affected":"2.2.0-b7"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p7:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p7"},{"last_affected":"2.2.0-p7"}],"source":"CPE_STRING"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:b8:*:*:*:*:*:*","range":[{"introduced":"2.2.0-b8"},{"last_affected":"2.2.0-b8"}]},{"range":[{"introduced":"2.2.0-p8"},{"last_affected":"2.2.0-p8"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p8:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p10:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p10"},{"last_affected":"2.2.0-p10"}],"source":"CPE_STRING"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p11:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p11"},{"last_affected":"2.2.0-p11"}],"source":"CPE_STRING"},{"range":[{"introduced":"2.2.0-p12"},{"last_affected":"2.2.0-p12"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p12:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p13:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p13"},{"last_affected":"2.2.0-p13"}],"source":"CPE_STRING"},{"range":[{"introduced":"2.2.0-p14"},{"last_affected":"2.2.0-p14"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p14:*:*:*:*:*:*"},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p15:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p15"},{"last_affected":"2.2.0-p15"}],"source":"CPE_STRING"},{"source":"CPE_STRING","cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p16:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p16"},{"last_affected":"2.2.0-p16"}]},{"cpe":"cpe:2.3:a:checkmk:checkmk:2.2.0:p17:*:*:*:*:*:*","range":[{"introduced":"2.2.0-p17"},{"last_affected":"2.2.0-p17"}],"source":"CPE_STRING"},{"range":[{"introduced":"2.2.0-p18"},{"last_affected":"2.2.0-p18"}]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