CVE•Published 2026-06-08•Modified 2026-06-08•0 articles on news•6 live references•NVD data
CVE-2026-9549Checkmk · Checkmk
Vulnerability data via NVD (ingested)
CVSS v3.1
4.8
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
EPSS percentile
—
Weaknesses (CWE)
Description
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.
Timeline
Published 2026-06-08
Modified 2026-06-08
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-9549Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product + version
product:"Checkmk Checkmk" version:"2.2.0"Version-pinned fingerprint from NVD's first vulnerable CPE.
Shodan · banner/body mention
http.html:"Checkmk"HTTP body or banner mentions "Checkmk" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-9549Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-9549Censys host search filtered to this CVE id.
grep.app
CVE-2026-9549Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-9549GitHub code search for direct mentions.
Google dork
"CVE-2026-9549" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-9549 on GitHub.
We haven't classified any articles referencing CVE-2026-9549 yet. The external references above still apply.