FKIE_CVE-2026-9549
Vulnerability from fkie_nvd - Published: 2026-06-08 13:16 - Updated: 2026-07-23 07:10
Severity
Summary
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.
References
| URL | Tags | ||
|---|---|---|---|
| security@checkmk.com | https://checkmk.com/werk/17993 | Vendor Advisory |
Impacted products
{
"affected": [
{
"affectedData": [
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"product": "Checkmk",
"vendor": "Checkmk GmbH",
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"source": "security@checkmk.com"
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"negate": false,
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Cross-site scripting almacenado en la salida de la comprobaci\u00f3n activa de descubrimiento de servicios en Checkmk \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48, y todas las versiones 2.2.0 permite a un administrador que puede configurar comprobaciones activas o personalizadas inyectar HTML o JavaScript malicioso en la salida de la comprobaci\u00f3n que se ejecuta en el navegador de un administrador o un usuario con permisos de lectura de host cuando ejecutan la comprobaci\u00f3n en la p\u00e1gina de descubrimiento de servicios."
}
],
"id": "CVE-2026-9549",
"lastModified": "2026-07-23T07:10:00.113",
"metrics": {
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{
"cvssData": {
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 1.7,
"impactScore": 2.7,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
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{
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "HIGH",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
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"subIntegrityImpact": "LOW",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
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"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
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],
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{
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"id": "CVE-2026-9549",
"options": [
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{
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{
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],
"role": "CISA Coordinator",
"timestamp": "2026-06-08T13:02:10.372370Z",
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},
"published": "2026-06-08T13:16:34.030",
"references": [
{
"source": "security@checkmk.com",
"tags": [
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],
"url": "https://checkmk.com/werk/17993"
}
],
"sourceIdentifier": "security@checkmk.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-79"
}
],
"source": "security@checkmk.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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