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2 vulnerabilities found for Backblaze Client by Backblaze
CVE-2026-19820 (GCVE-0-2026-19820)
Vulnerability from nvd – Published: 2026-09-01 00:13 – Updated: 2026-09-01 00:13
VLAI
EPSS
VEX
Title
Backblaze Client for Windows Improper Link Resolution Vulnerability
Summary
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.
Severity
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Backblaze | Backblaze Client |
Affected:
10.0.0.1029
(custom)
Affected: 10.0.1.10307 (custom) Affected: 10.0.2.1047 (custom) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"platforms": [
"Windows"
],
"product": "Backblaze Client",
"vendor": "Backblaze",
"versions": [
{
"status": "affected",
"version": "10.0.0.1029",
"versionType": "custom"
},
{
"status": "affected",
"version": "10.0.1.10307",
"versionType": "custom"
},
{
"status": "affected",
"version": "10.0.2.1047",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "coordinator",
"value": "TrendAI Zero Day Initiative"
},
{
"lang": "en",
"type": "finder",
"value": "hamdi"
}
],
"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\u0027s 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": [
{
"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"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-59 Improper Link Resolution Before File Access",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T00:13:03.935Z",
"orgId": "4ac701fe-44e9-4bcd-9585-dd6449257611",
"shortName": "Bugcrowd"
},
"references": [
{
"url": "https://www.backblaze.com/computer-backup/docs/backup-client-release-notes-windows"
},
{
"url": "https://www.backblaze.com/status/update"
}
],
"title": "Backblaze Client for Windows Improper Link Resolution Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "4ac701fe-44e9-4bcd-9585-dd6449257611",
"assignerShortName": "Bugcrowd",
"cveId": "CVE-2026-19820",
"datePublished": "2026-09-01T00:13:03.935Z",
"dateReserved": "2026-08-14T05:28:19.979Z",
"dateUpdated": "2026-09-01T00:13:03.935Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-19820 (GCVE-0-2026-19820)
Vulnerability from cvelistv5 – Published: 2026-09-01 00:13 – Updated: 2026-09-01 00:13
VLAI
EPSS
VEX
Title
Backblaze Client for Windows Improper Link Resolution Vulnerability
Summary
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.
Severity
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Backblaze | Backblaze Client |
Affected:
10.0.0.1029
(custom)
Affected: 10.0.1.10307 (custom) Affected: 10.0.2.1047 (custom) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"platforms": [
"Windows"
],
"product": "Backblaze Client",
"vendor": "Backblaze",
"versions": [
{
"status": "affected",
"version": "10.0.0.1029",
"versionType": "custom"
},
{
"status": "affected",
"version": "10.0.1.10307",
"versionType": "custom"
},
{
"status": "affected",
"version": "10.0.2.1047",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "coordinator",
"value": "TrendAI Zero Day Initiative"
},
{
"lang": "en",
"type": "finder",
"value": "hamdi"
}
],
"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\u0027s 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": [
{
"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"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-59 Improper Link Resolution Before File Access",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T00:13:03.935Z",
"orgId": "4ac701fe-44e9-4bcd-9585-dd6449257611",
"shortName": "Bugcrowd"
},
"references": [
{
"url": "https://www.backblaze.com/computer-backup/docs/backup-client-release-notes-windows"
},
{
"url": "https://www.backblaze.com/status/update"
}
],
"title": "Backblaze Client for Windows Improper Link Resolution Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "4ac701fe-44e9-4bcd-9585-dd6449257611",
"assignerShortName": "Bugcrowd",
"cveId": "CVE-2026-19820",
"datePublished": "2026-09-01T00:13:03.935Z",
"dateReserved": "2026-08-14T05:28:19.979Z",
"dateUpdated": "2026-09-01T00:13:03.935Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}