Session hijacking via exposed session signing secret in distributed Checkmk setups_CVE-2025-64998

{
    "lastseen": "",
    "description": "Exposure of session signing secret in Checkmk <2.4.0p23, <2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.",
    "published": "2026-03-24T11:25:58.183Z",
    "modified": "2026-03-25T03:55:50.621Z",
    "type": "cve",
    "title": "Session hijacking via exposed session signing secret in distributed Checkmk setups",
    "source": "Checkmk",
    "references": "https://checkmk.com/werk/18954",
    "id": "CVE-2025-64998",
    "bulletinFamily": "",
    "cwe": [
        "CWE-522"
    ],
    "cvelist": null,
    "sourceData": "Checkmk GmbH Checkmk 2.4.0\nCheckmk GmbH Checkmk 2.3.0\nCheckmk GmbH Checkmk 2.2.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.3,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/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": "2.4.0",
    "vendor": "Checkmk GmbH",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}