FKIE_CVE-2026-8833
Vulnerability from fkie_nvd - Published: 2026-06-08 13:16 - Updated: 2026-07-23 07:10
Severity
Summary
Improper neutralization of HTML-encoded characters in the URL validation function in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an authenticated user to bypass URL validation and inject malicious URLs such as javascript: URIs, resulting in cross-site scripting when another user interacts with the crafted link.
References
| URL | Tags | ||
|---|---|---|---|
| security@checkmk.com | https://checkmk.com/werk/20002 | Vendor Advisory |
Impacted products
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"negate": false,
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Improper neutralization of HTML-encoded characters in the URL validation function in Checkmk \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48, and all 2.2.0 versions allows an authenticated user to bypass URL validation and inject malicious URLs such as javascript: URIs, resulting in cross-site scripting when another user interacts with the crafted link."
},
{
"lang": "es",
"value": "La neutralizaci\u00f3n inadecuada de caracteres codificados en HTML en la funci\u00f3n de validaci\u00f3n de URL en Checkmk versiones \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48 y todas las versiones 2.2.0 permite a un usuario autenticado eludir la validaci\u00f3n de URL e inyectar URL maliciosas como URI javascript:, lo que resulta en cross-site scripting cuando otro usuario interact\u00faa con el enlace manipulado."
}
],
"id": "CVE-2026-8833",
"lastModified": "2026-07-23T07:10:00.113",
"metrics": {
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{
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
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"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
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],
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{
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
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"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
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"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
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"userInteraction": "ACTIVE",
"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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"options": [
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{
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{
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],
"role": "CISA Coordinator",
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"references": [
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"source": "security@checkmk.com",
"tags": [
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"url": "https://checkmk.com/werk/20002"
}
],
"sourceIdentifier": "security@checkmk.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
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{
"lang": "en",
"value": "CWE-79"
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],
"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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