CVE-2025-62839: Hardcoded Key in HBS 3 Hybrid Backup Sync (<26.4.0.521)
CVE-2025-62839 Published on October 29, 2026
Hard-coded Cryptographic Key #1
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
Vulnerability Analysis
Attack Vector:
ADJACENT
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Weakness Type
Use of Hard-coded Cryptographic Key
The use of a hard-coded cryptographic key significantly increases the possibility that encrypted data may be recovered.
Affected Versions
QNAP Systems Inc. HBS 3 Hybrid Backup Sync:- Version 26.4.x and below 26.4.0.521 is affected.
- Version 26.4.x and below 26.4.0.521 is affected.
- Version 26.4.x and below 26.4.1.563 is affected.