Vulnerability · Published Jun 9, 2026 · Assigned by hackerone
CVE-2026-44963
Critical 9.4
In plain English
A critical-severity unsafe deserialization in Backup and Replication from Veeam. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 4.0)9.4Critical
Exploit odds (30 days)2.4%top 16.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
A vulnerability allowing remote code execution (RCE) on the Backup Server by an authenticated domain user.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Veeam | Backup and Replication | 0 – before 12.3.2 |
Weakness: CWE-502 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H