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vuln-cve/data/2026/8xxx/CVE-2026-8833.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-8833",
"assignerOrgId": "f7d6281c-4801-44ce-ace2-493291dedb0f",
"state": "PUBLISHED",
"assignerShortName": "Checkmk",
"dateReserved": "2026-05-18T14:06:43.958Z",
"datePublished": "2026-06-08T12:06:51.267Z",
"dateUpdated": "2026-06-08T13:02:45.679Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Checkmk",
"vendor": "Checkmk GmbH",
"versions": [
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"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",
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}
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],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Arvato Systems Offensive Security"
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"impacts": [
{
"capecId": "CAPEC-63",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-63: Cross-Site Scripting (XSS)"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"baseScore": 8.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N",
"version": "4.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "f7d6281c-4801-44ce-ace2-493291dedb0f",
"shortName": "Checkmk",
"dateUpdated": "2026-06-08T12:06:51.267Z"
},
"references": [
{
"url": "https://checkmk.com/werk/20002",
"tags": [
"vendor-advisory"
]
}
],
"title": "XSS in urls",
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"vulnerable": true,
"criteria": "cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.5.0",
"versionEndExcluding": "2.5.0p5"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.4.0",
"versionEndExcluding": "2.4.0p31"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.3.0",
"versionEndExcluding": "2.3.0p48"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:*:*:*:*:*:*:*"
}
]
}
]
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
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},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-06-08T13:02:39.672018Z",
"id": "CVE-2026-8833",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}