# CVE-2026-21672: A vulnerability allowing local privilege escalation on Windows-based Veeam Backup & Replication servers.

Source: https://junglewise.ai/threats/cve-2026-21672-a-vulnerability-allowing-local-privilege-escalation-on-windows  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-12. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-21672 · Severity: high · CVSS 8.8 · Published 2026-03-12

A vulnerability in Veeam Backup & Replication allows a user with low-level access to a Windows server to gain full administrative control. Veeam is a critical data protection and backup solution used to safeguard corporate data; an attacker who gains administrative rights could potentially access, modify, or delete sensitive backups. This could lead to significant data loss or provide a foothold for further attacks within the corporate network.

## Quick answers

**Is CVE-2026-21672 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21672 being exploited in the wild.

**How severe is CVE-2026-21672?** High severity, with a CVSS score of 8.8, published 12 March 2026.

**Which products and versions are affected?** Veeam Backup & Replication 12, 12.1, 12.2, 12.3, 12.3.1, 12.3.2 (prior to build 12.3.2.4465); Veeam Backup & Replication 13 (prior to build 13.0.1.2067).

**Is there a fix for CVE-2026-21672?** A patch was published on 2026-03-12: Fixed in builds 12.3.2.4465 and 13.0.1.2067. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-21672 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-21672?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A local privilege escalation vulnerability exists in Windows-based Veeam Backup & Replication servers. The flaw is categorized as CWE-538 (Insertion of Sensitive Information into Externally-Accessible File or Directory), suggesting that sensitive data or configuration files may be improperly secured, allowing a low-privileged local user to leverage this information to escalate their privileges. An attacker with local access and low-level permissions can achieve full system or administrative control (Scope: Changed). The vulnerability is resolved in Veeam Backup & Replication versions 12.3.2.4465 and 13.0.1.2067.

## Affected products

- Veeam Backup & Replication 12, 12.1, 12.2, 12.3, 12.3.1, 12.3.2 (prior to build 12.3.2.4465)
- Veeam Backup & Replication 13 (prior to build 13.0.1.2067)

## Timeline

- 2026-03-12: disclosed: Initial disclosure via NVD and Veeam KB articles.
- 2026-03-12: patched: Fixed in builds 12.3.2.4465 and 13.0.1.2067.
- 2026-04-16: other: Veeam KB articles last modified.

## References

- [https://www.veeam.com/kb4830](https://www.veeam.com/kb4830)
- [https://www.veeam.com/kb4831](https://www.veeam.com/kb4831)