XSS in urls_CVE-2026-8833

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-08T12:06:51.267Z",
    "modified": "2026-06-08T12:06:51.267Z",
    "type": "cve",
    "title": "XSS in urls",
    "source": "Checkmk",
    "references": "https://checkmk.com/werk/20002",
    "id": "CVE-2026-8833",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79"
    ],
    "cvelist": null,
    "sourceData": "Checkmk GmbH Checkmk 2.5.0\nCheckmk GmbH Checkmk 2.4.0\nCheckmk GmbH Checkmk 2.3.0\nCheckmk GmbH Checkmk 2.2.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.5,
        "severity": "HIGH",
        "vector": "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"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Checkmk",
    "version": "2.5.0",
    "vendor": "Checkmk GmbH",
    "ai_description": "Cross-site scripting vulnerability due to improper neutralization of HTML-encoded characters in the URL validation function",
    "ai_severity": "High",
    "ai_vendor": "Checkmk GmbH",
    "ai_product": "Checkmk",
    "ai_version": "2.5.0, 2.4.0, 2.3.0, 2.2.0",
    "ai_score": 8.5
}