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Vulnerabilities Resolved in Veeam Backup & Replication 12.3.2 P4

KB ID: 4934
Product: Veeam Backup & Replication | 12 | 12.1 | 12.2 | 12.3 | 12.3.1 | 12.3.2
Published: 2026-10-06
Last Modified: 2026-10-06
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Article Applicability

All vulnerabilities listed in this article:

  • Affect only Veeam Backup & Replication 12.3.2 P3 (build 12.3.2.4854) and older builds.
  • Are resolved in Veeam Backup & Replication 12.3.2 P4 (build 12.3.2.4934).
  • Do not affect any Veeam Backup & Replication version 13 builds.

Customers are reminded that Veeam Backup & Replication version 12 will reach End of Support on 2027-02-28.

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-2025-64393

A vulnerability allowing a low-privileged user with the Backup Viewer role to perform remote code execution (RCE) on the Veeam Backup Server through insecure deserialization of untrusted data received via the Mount Service.

Severity: Critical
CVSS v4.0 Score: 9.4CVSS:4.0/AV:N/AC:L/AT:N/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-2026-93026

A vulnerability allowing an authenticated user with the Backup Viewer role to modify or delete the Enterprise Manager master key and read or overwrite stored antivirus update credentials on the Veeam Backup Server.

Severity: Medium
CVSS v4.0 Score: 6.1CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
Source: Reported through HackerOne.

Affected Product
Solution

This vulnerability was fixed starting in the following build:

CVE-2025-64392

A reflected cross-site scripting vulnerability in Veeam Backup Enterprise Manager allows an attacker to execute script in the browser of an authenticated portal user who opens a crafted link.

Severity: Medium
CVSS v4.0 Score: 4.8CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: Reported through HackerOne.

Affected Product
  • Veeam Backup Enterprise Manager (Veeam Backup & Replication) 12.3.2.4854 and all earlier version 12 builds.
    Note: Version 13 is not affected.
Solution

This vulnerability was fixed starting in the following build:

If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.

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