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CriticalVulnerabilityCVE-2026-106076updated 27 Oct 2026, 20:35 UTC

Veeam Backup for Microsoft 365 flaw lets a peer run commands on the server

A flaw in Veeam's Microsoft 365 backup software can let a connected organization sneak database commands into the server and take control of it. This can expose or change configuration data for other customers.

Official, 2 sources
SeverityCriticalCVSS 9 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Malicious peerHolds a valid transfer relationship
  2. 2Crafted transfer requestInjects SQL into configuration input
  3. 3Config databaseInjected SQL executes unchecked
  4. 4Code executionRuns as PostgreSQL service account
  5. ResultAttacker controls the backup server

What happened

An authenticated organization-transfer peer can inject SQL into the configuration database of the source Veeam Backup for Microsoft 365 server, enabling cross-tenant read/write of configuration data and remote code execution as the PostgreSQL service account.

Why it is dangerous: An attacker with a valid peer relationship could read and modify data belonging to other tenants and run code on the backup server, putting backup integrity and the Microsoft 365 data it protects at risk.

Are you affected?

You are affected if you run Veeam Backup for Microsoft 365 and use organization-transfer (tenant transfer) with peer servers.

What to do

  1. Check the Veeam Backup for Microsoft 365 advisory and apply the vendor's patch as soon as it is available for your version
  2. Review which peer servers and organization-transfer relationships are configured, and remove any you do not recognize or need
  3. Restrict access to the backup server and monitor it for unusual database activity until patched

Timeline

  1. 27 Oct 2026, 17:16 UTC
    Publicly disclosed
  2. 27 Oct 2026, 17:16 UTC
    Reported by NVD · NVD
  3. 27 Oct 2026, 17:20 UTC
    Picked up by Zero Radar
  4. 27 Oct 2026, 20:35 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-106076 · GHSA-cvj7-8m64-3q4v
CVSS
9 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
27 Oct 2026, 17:16 UTC
On Zero Radar
27 Oct 2026, 17:20 UTC (4 min after disclosure)
Last change
27 Oct 2026, 20:35 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Veeam Backup for Microsoft 365 flaw lets a peer run commands on the server · Zero Radar