{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-19820",
        "assignerOrgId": "4ac701fe-44e9-4bcd-9585-dd6449257611",
        "state": "PUBLISHED",
        "assignerShortName": "Bugcrowd",
        "dateReserved": "2026-08-14T05:28:19.979Z",
        "datePublished": "2026-09-01T00:13:03.935Z",
        "dateUpdated": "2026-09-01T00:13:03.935Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "4ac701fe-44e9-4bcd-9585-dd6449257611",
                "shortName": "Bugcrowd",
                "dateUpdated": "2026-09-01T00:13:03.935Z"
            },
            "title": "Backblaze Client for Windows Improper Link Resolution Vulnerability",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-59 Improper Link Resolution Before File Access"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Backblaze",
                    "product": "Backblaze Client",
                    "platforms": [
                        "Windows"
                    ],
                    "versions": [
                        {
                            "version": "10.0.0.1029",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "10.0.1.10307",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "10.0.2.1047",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "A vulnerability in the Backblaze Client allows a local user to make the system not bootable by creating a link from Backblaze's folder to Windows OS system files during a backup. Successful exploitation requires an administrator-level system change that results in the absence of specific Windows OS security controls. This vulnerability is due to improper link resolution."
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV4_0": {
                        "baseScore": 5.8,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:L",
                        "version": "4.0"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "TrendAI Zero Day Initiative",
                    "type": "coordinator"
                },
                {
                    "lang": "en",
                    "value": "hamdi",
                    "type": "finder"
                }
            ],
            "references": [
                {
                    "url": "https://www.backblaze.com/computer-backup/docs/backup-client-release-notes-windows"
                },
                {
                    "url": "https://www.backblaze.com/status/update"
                }
            ]
        }
    }
}