CVE Explorer
CVE-2026-9549
Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, 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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Checkmk","vendor":"Checkmk GmbH","versions":[{"lessThan":"2.5.0p5","status":"affected","version":"2.5.0","versionType":"semver"},{"lessThan":"2.4.0p31","status":"affected","version":"2.4.0","versionType":"semver"},{"lessThan":"2.3.0p48","status":"affected","version":"2.3.0","versionType":"semver"},{"status":"affected","version":"2.2.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3fd76566ca2d539a65246f0b663247c087bd498879391ac032d8641cdbece0ff · sha256:d626328a6b56c63f… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"baseScore":4.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","version":"4.0"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3fd76566ca2d539a65246f0b663247c087bd498879391ac032d8641cdbece0ff · sha256:d626328a6b56c63f… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3fd76566ca2d539a65246f0b663247c087bd498879391ac032d8641cdbece0ff · sha256:d626328a6b56c63f… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"tags":["vendor-advisory"],"url":"https://checkmk.com/werk/17993"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3fd76566ca2d539a65246f0b663247c087bd498879391ac032d8641cdbece0ff · sha256:d626328a6b56c63f… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.