CVE-2025-64394
MediumCVSS 4.3Summary
A low-privileged local user can 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.
Risk Assessment
This may allow a local attacker to gain SYSTEM privileges or corrupt the installation, posing a serious threat to the host.
Recommendation
Apply the vendor patch, restrict local access to the installation host, and perform installation in a controlled environment.
Other vulnerabilities in Veeam Backup for Microsoft 365
See all- CVE-2026-106078Medium
An unauthenticated attacker can bypass REST API authentication with a forged federation token and receive responses from REST API endpoints that do not call the Veeam Backup for Microsoft 365 backup service.
- CVE-2026-106077High
A vulnerability allowing a user with the Veeam Backup for Microsoft 365 Administrator role to read arbitrary files on the backup server with LocalSystem privileges.
- CVE-2026-106076Critical
A vulnerability allowing an authenticated organization-transfer peer to inject SQL into the configuration database of the source Veeam Backup for Microsoft 365 server, leading to cross-tenant read and write of configuration data and remote code execution as the PostgreSQL service account.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS