Vulnerability · Published Oct 29, 2026 · Assigned by qnap
CVE-2025-62839Hard-coded Cryptographic Key #1
High 8.7
In plain English
A high-severity security flaw in HBS 3 Hybrid Backup Sync from QNAP Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Official description
An use of hard-coded cryptographic key vulnerability has been reported to affect HBS 3 Hybrid Backup Sync and Hybrid Backup Sync. If exploited, the vulnerability could allow remote attackers to compromise the security of the system. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.4.0.521 and later Hybrid Backup Sync 26.4.0.521 and later Hybrid Backup Sync 26.4.1.563 and later
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| QNAP Systems Inc. | HBS 3 Hybrid Backup Sync | 26.4.x – before 26.4.0.521 |
| QNAP Systems Inc. | Hybrid Backup Sync | 26.4.x – before 26.4.0.52126.4.x – before 26.4.1.563 |
Weakness: CWE-321 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N