High
Cross Site Scripting through compromised remote site
Type: advisorySources: OSV
Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-39663
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:03 UTC · Revision 1
Source evidence
Cross Site Scripting through compromised remote site
core-osv · Original sourcePublished 30 Oct 2025, 10:43 UTC
Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).
osv:CVE-2025-39663
Complete source record
{
"id": "a38739679f693f3e617fc70c58b08111d66daa560309a3cf6be17ddc2906b4a2",
"url": "https://osv.dev/vulnerability/CVE-2025-39663",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Cross Site Scripting through compromised remote site",
"summary": "Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).",
"evidence": "osv:CVE-2025-39663",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2025-39663",
"aliases": [
"CVE-2025-39663"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
}
],
"affected": [
{
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"type": "GIT",
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},
{
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"versions": [
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"2.3.0-p17",
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"2.3.0-p19",
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"2.4.0-NA",
"2.4.0-p1",
"2.4.0-p10",
"2.4.0-p11",
"2.4.0-p12",
"2.4.0-p13",
"2.4.0-p2",
"2.4.0-p3",
"2.4.0-p4",
"2.4.0-p5",
"2.4.0-p6",
"2.4.0-p7",
"2.4.0-p9"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39663.json"
}
}
],
"modified": "2026-10-28T02:30:37.071262865Z",
"provider": "osv",
"references": [
"https://checkmk.com/werk/17998",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39663.json",
"https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting",
"https://nvd.nist.gov/vuln/detail/CVE-2025-39663"
],
"provider_metadata": {
"cwe_ids": [
"CWE-80"
],
"cna_assigner": "Checkmk",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "2.2.0"
},
{
"last_affected": "2.2.0"
},
{
"introduced": "2.1.0"
},
{
"last_affected": "2.1.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "2.4.0"
},
{
"fixed": "2.4.0p14"
},
{
"introduced": "2.3.0"
},
{
"fixed": "2.3.0p39"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39663.json"
}
},
"related_cves": [
{
"value": "CVE-2025-39663",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504443,
"published_at": "2025-10-30T10:43:08.5+00:00"
}