PT-2026-47752 · Veeam · Veeam Backup & Replication
CVE-2026-44963
·
Published
2026-06-09
·
Updated
2026-09-03
CVSS v4.0
9.4
Critical
| Vector | AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Name of the Vulnerable Software and Affected Versions
Veeam Backup & Replication versions prior to 12.3.2.4854
Description
A critical flaw in the deserialization mechanism allows an authenticated domain user with low privileges to execute arbitrary code remotely on the Backup Server. This issue specifically impacts domain-joined installations, while workgroup deployments remain unaffected. Successful exploitation can lead to a full compromise of the backup infrastructure, potentially granting the attacker NT AUTHORITYSYSTEM privileges. Deserialization is the process of taking data from a format like JSON or XML and converting it back into an object that a program can use; a flaw here allows attackers to inject malicious objects that the system executes.
Recommendations
Update Veeam Backup & Replication to version 12.3.2.4854.
As a defense-in-depth measure, avoid joining backup servers to a Windows domain.
Fix
RCE
Deserialization of Untrusted Data
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Weakness Enumeration
Related Identifiers
Affected Products
Veeam Backup & Replication