Critical RCE and Privilege-Escalation Vulnerabilities Patched in Veeam Backup & Replication

Veeam released security updates for Veeam Backup & Replication (VBR) addressing multiple vulnerabilities, including four critical remote code execution (RCE) flaws that could allow code execution on backup servers under certain access conditions. Reported issues include RCE paths for low-privileged domain users (CVE-2026-21666, CVE-2026-21667, CVE-2026-21669) and an additional RCE scenario where a Backup Viewer could achieve code execution as the postgres user (CVE-2026-21708). Veeam also fixed several high-severity issues enabling actions such as privilege escalation on Windows-based VBR servers, extraction of saved SSH credentials, and bypassing restrictions to manipulate arbitrary files on a Backup Repository.

The Canadian Centre for Cyber Security relayed Veeam’s advisory and urged organizations to apply updates, noting affected branches as VBR 12 and 13 prior to fixed releases. Veeam’s fixes are available in Veeam Backup & Replication 12.3.2.4465 and 13.0.1.2067, and the vendor warned that attackers commonly reverse-engineer patches shortly after release to target unpatched deployments—an elevated concern given VBR’s frequent targeting in ransomware operations. Other Canadian Centre advisories in the same period covered unrelated vendor updates (e.g., ABB, GitHub, Splunk, JetBrains, Hitachi, VMware, Fortinet, Mozilla) and do not describe the Veeam RCE issue.