SB2026031251 - Multiple vulnerabilities in Veeam Backup & Replication
Published: March 12, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 vulnerabilities.
1) Input validation error (CVE-ID: CVE-2026-21671)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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
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.
2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2026-21670)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due to improperly imposed security restrictions. A remote low-privileged user can extract saved SSH credentials and gain unauthorized access to other systems.
3) Input validation error (CVE-ID: CVE-2026-21669)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input. A remote authenticated domain user can execute arbitrary code on the Backup Server.
4) Input validation error (CVE-ID: CVE-2026-21708)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input. A remote user can execute arbitrary code with privileged of the postgres user.
5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2026-21672)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improperly imposed security restrictions. A local user can execute arbitrary code with elevated privileges.
6) Protection mechanism failure (CVE-ID: CVE-2026-21668)
CWE-ID: CWE-693 - Protection Mechanism Failure
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote user to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures. A remote authenticated domain user can bypass restrictions and manipulate arbitrary files on a Backup Repository.
7) Input validation error (CVE-ID: CVE-2026-21667)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input. A remote authenticated domain user can execute arbitrary code on the Backup Server.
8) Input validation error (CVE-ID: CVE-2026-21666)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input. A remote authenticated domain user can execute arbitrary code on the Backup Server.
Remediation
Install update from vendor's website.