Quick answers
- Is CVE-2026-44963 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-44963 being exploited in the wild.
- How severe is CVE-2026-44963?
- Informational severity, with a CVSS score of 9.4, published 9 June 2026.
- Which products and versions are affected?
- Veeam Backup & Replication 12.x builds prior to 12.3.2.4854.
- Is there a fix for CVE-2026-44963?
- A patch was published on 2026-06-09: Fixed in version 12.3.2.4854 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-44963 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-44963?
- Check whether you run Veeam Backup & Replication at an affected version. 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 remote code execution (RCE) vulnerability exists in Veeam Backup & Replication due to the insecure deserialization of untrusted data (CWE-502). The flaw allows an attacker who is authenticated as a domain user to execute arbitrary code on the Backup Server, provided the server is domain-joined. The vulnerability affects all version 12 builds prior to 12.3.2.4854. Version 13.x is not affected due to architectural changes. Users are advised to update to build 12.3.2.4854 or migrate to version 13 to mitigate the risk.
Affected products
- Veeam Backup & Replication 12.x builds prior to 12.3.2.4854
Timeline
- 2026-06-09: disclosed
- 2026-06-09: patched: Fixed in version 12.3.2.4854
- 2026-06-09: advisory