CVE-2025-64394
Medium
Description
A vulnerability allowing a low-privileged local user to write arbitrary files with SYSTEM privileges during the installation of Veeam Backup for Microsoft 365, which can lead to privilege escalation or denial of service.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Backup for Microsoft 365
PublishedOct 27, 2026
First seenOct 27, 2026
Weakness typeCWE-1386CWE-1386
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Veeam Backup for Microsoft 365 | 8.0 ≤ v ≤ 8.6.0.1102 | — |
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