CVE-2026-21671 Code injection in Software Appliance
Authenticated Backup Administrators can achieve remote code execution in high availability deployments of Veeam Backup & Replication.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21671?
CVE-2026-21671 is a critical code injection vulnerability in Veeam Software Appliance, published on 12 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication.
Which versions are affected by CVE-2026-21671?
It affects 1 product.
Products include Veeam Veeam Backup \& Replication.
How do I fix CVE-2026-21671?
No fix has been published for CVE-2026-21671 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-21671 being exploited?
There is no known exploitation of CVE-2026-21671 in the wild and no public exploit code.
Other vulnerabilities in Veeam Software Appliance
- CVE-2024-40711 Veeam Backup and Replication Deserialization
- CVE-2022-26501 Veeam Backup & Replication Remote Code Execution
- CVE-2022-26500 Veeam Backup & Replication Remote Code Execution
- CVE-2023-27532 Veeam Backup & Replication Cloud Connect Missing Authentication for Critical Function
- CVE-2026-21666 Missing authorization in Backup and Replication
Sources
Also known as GHSA-9prx-6fqf-vvjh.