Veeam ONE: MFA bypass by disabling MFA with Administrator credentials
Summary
Veeam ONE 13.1 up to build 13.1.0.7233 allows an attacker with valid Administrator credentials to disable multi-factor authentication globally before completing MFA verification. The attacker can then keep access to the product without the second factor. The attack is network-reachable and low-complexity but requires high privileges; Veeam rates it High (CVSS v4.0 8.5).
Affected
- Veeam ONE 13.1 builds up to and including 13.1.0.7233
- Older versions (e.g., 13.0.x and 12.x) are not affected according to Veeam
- Veeam Backup & Replication is not covered by this CVE
Fixed in
- Veeam ONE 13.1 P1 (build 13.1.0.7940) per Veeam KB4951
Workaround
- Unknown. Veeam's advisory lists only the patched build and no workaround.
- Detection step: verify that MFA is still enabled on Veeam ONE and treat the Administrator account as compromised if MFA was turned off without authorisation.
Exploitation
- No known exploitation at the time of writing.
- No public exploit according to PSIRT data; no CISA KEV entry.
- EPSS score: 0.35 %.
Our recommendation
- Check whether Veeam ONE is installed and confirm its build.
- If the build is 13.1.0.7233 or earlier, update to Veeam ONE 13.1 P1 (13.1.0.7940) per KB4951.
- Verify that MFA is enabled on all Veeam ONE administrator accounts and review recent admin logins and MFA setting changes.
- Restrict Administrator rights and limit access to the Veeam ONE management interface to management networks.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Veeam KB4951: Vulnerabilities Resolved in Veeam ONE 13.1 Patch 1 www.veeam.com
- Heise: Veeam Backup servers can be tampered with, MFA disabled www.heise.de
- PSIRT: CVE-2026-107671 psirt.com
- CIRCL vulnerability database: Veeam vulnerability.circl.lu
- Threatint: CVE-2026-107671 cve.threatint.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 09:57.
Original description (NVD)
A vulnerability allowing an attacker with valid Administrator credentials to bypass multi-factor authentication by disabling it globally before completing MFA verification.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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