Input validation error in Backup & Replication - CVE-2026-21671
Published: March 12, 2026
Vulnerability identifier: #VU123974
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21671
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Veeam
Affected software:
Backup & Replication
Backup & Replication
Detailed vulnerability description
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to insufficient validation of user-supplied input. A remote user with the Backup Administrator role can execute arbitrary code in high availability (HA) deployments.
How to mitigate CVE-2026-21671
Install updates from vendor's website.