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Critical Veeam ONE Flaw Allows Remote Attackers to Expose Service Account Credentials via Forced SMB Authentication

Veeam has patched a critical vulnerability in Veeam ONE that enables a remote unauthenticated attacker to force SMB authentication attempts using the platform's service account. Identified as CVE-2026-65641 with a CVSS score of 9.3, the flaw impacts version 13.1.0.7034 and all prior builds of the 13.x line, while 12.x installations remain unaffected. Exploitation allows an attacker to redirect SMB authentication to a controlled server, exposing Net-NTLM material that can be used for offline password cracking or NTLM relay attacks against other services. The severity depends on the privileges of the compromised account, with elevated risk in environments where Veeam ONE runs with high privileges or broad access to Active Directory, backup servers, and hypervisors. Patches are available in Veeam ONE 13.1 Patch 0 (build 13.1.0.7233) and Veeam ONE 13.0.2 Patch 1 (build 13.0.2.7159), and organizations are urged to apply updates immediately.

BoletimSecTranslated from Portuguese

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Veeam has addressed a critical vulnerability in Veeam ONE that could allow a remote unauthenticated attacker to force SMB authentication attempts from the platform's service account.

The flaw, tracked as CVE-2026-65641 and rated CVSS 9.3, affects Veeam ONE 13.1.0.7034 and all earlier builds in the 13.x series. Installations running the 12.x line are not vulnerable, according to the vendor.

By exploiting the issue, an attacker can redirect SMB authentication traffic to a server under their control. In Windows environments, this exposes Net-NTLM authentication material tied to the service account. The captured credentials can then be leveraged for offline password cracking attempts or NTLM relay attacks against other services.

The overall impact depends primarily on the permissions granted to the affected account. Risk is significantly higher when Veeam ONE operates with elevated privileges or maintains broad access to Active Directory, backup servers, hypervisors, and other critical infrastructure components.

Patches are now available in Veeam ONE 13.1 Patch 0 (build 13.1.0.7233) and Veeam ONE 13.0.2 Patch 1 (build 13.0.2.7159). Systems running earlier builds should be updated as a priority.

Active DirectoryVeeam ONECVE-2026-65641Net-NTLM
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