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        "cveId": "CVE-2025-64998",
        "assignerOrgId": "f7d6281c-4801-44ce-ace2-493291dedb0f",
        "state": "PUBLISHED",
        "assignerShortName": "Checkmk",
        "dateReserved": "2025-11-12T09:16:24.093Z",
        "datePublished": "2026-03-24T11:25:58.183Z",
        "dateUpdated": "2026-03-25T03:55:50.621Z"
    },
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                    "defaultStatus": "unaffected",
                    "product": "Checkmk",
                    "vendor": "Checkmk GmbH",
                    "versions": [
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                            "status": "affected",
                            "version": "2.4.0",
                            "versionType": "semver"
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                            "lessThan": "2.3.0p45",
                            "status": "affected",
                            "version": "2.3.0",
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                            "version": "2.2.0",
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            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Lisa Gnedt (SBA Research)"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-196",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-196: Session Credential Falsification through Forging"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "baseScore": 7.3,
                        "baseSeverity": "HIGH",
                        "vectorString": "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",
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            ],
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                {
                    "descriptions": [
                        {
                            "cweId": "CWE-522",
                            "description": "CWE-522: Insufficiently Protected Credentials",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
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            "providerMetadata": {
                "orgId": "f7d6281c-4801-44ce-ace2-493291dedb0f",
                "shortName": "Checkmk",
                "dateUpdated": "2026-03-24T11:25:58.183Z"
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            "references": [
                {
                    "url": "https://checkmk.com/werk/18954",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
            "title": "Session hijacking via exposed session signing secret in distributed Checkmk setups",
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                                    "vulnerable": true,
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                                    "versionStartIncluding": "2.4.0",
                                    "versionEndExcluding": "2.4.0p23"
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                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.3.0",
                                    "versionEndExcluding": "2.3.0p45"
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                                    "criteria": "cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*",
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            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-24T00:00:00+00:00",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
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                                        "Automatable": "no"
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                                        "Technical Impact": "total"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3",
                                "id": "CVE-2025-64998"
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                "title": "CISA ADP Vulnrichment",
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