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.
Published: 2026-10-27
Score: 4.3 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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References
Link Providers
https://www.veeam.com/kb4957 cve-icon cve-icon
History

Tue, 27 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
Title Privilege Escalation in Veeam Backup for Microsoft 365 via Installation File Write

Tue, 27 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-1386
References
Metrics cvssV4_0

{'score': 4.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-10-27T16:16:58.979Z

Reserved: 2025-10-31T15:00:01.447Z

Link: CVE-2025-64394

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-27T17:16:53.867

Modified: 2026-10-27T17:16:53.867

Link: CVE-2025-64394

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T18:00:08Z

Weaknesses
  • CWE-1386

    Insecure Operation on Windows Junction / Mount Point