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Vulnerabilities Resolved in Veeam Backup for Microsoft 365 8.6

KB ID: 4957
Product: Veeam Backup for Microsoft 365 | 8.6
Published: 2026-10-27
Last Modified: 2026-10-26
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Veeam Software Security Commitment
Veeam® is committed to ensuring its products protect customers from potential risks. As part of that commitment, we operate a Vulnerability Disclosure Program (VDP) for all Veeam products and perform extensive internal code audits. When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information. This approach ensures that all potentially affected customers can quickly implement the necessary measures to safeguard their systems. It’s important to note that once a vulnerability and its associated patch are disclosed, attackers will likely attempt to reverse-engineer the patch to exploit unpatched deployments of Veeam software. This reality underscores the critical importance of ensuring that all customers use the latest versions of our software and install all updates and patches without delay.

Issue Details

CVE-2026-106076

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.

Severity: Critical
CVSS v4.0 Score: 9.0CVSS: AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: Reported through HackerOne.

Affected Product
Solution

This vulnerability was fixed starting in the following build:

CVE-2026-106077

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.

Severity: High
CVSS v4.0 Score: 8.3CVSS: AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N
Source: Reported through HackerOne.

Affected Product
Solution

This vulnerability was fixed starting in the following build:

CVE-2026-106078

A vulnerability allowing an unauthenticated attacker to 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.

Severity: Medium
CVSS v4.0 Score: 6.9CVSS: AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: Reported through HackerOne.

Affected Product
Solution

This vulnerability was fixed starting in the following build:

CVE-2025-64394

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.

Severity: Medium
CVSS v4.0 Score: 4.3CVSS: AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Source: Reported through HackerOne.

Affected Product
Solution

This vulnerability was fixed starting in the following build:

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