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VulnerabilityPublished

CVE-2025-62839: An use of hard-coded cryptographic key vulnerability has been reported to affect HBS 3 Hybrid Backup

Source GCVE Database

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Authoritative record:CVE-2025-62839· High 8.7

Not known to be exploited · CVSS 8.7 High : upgrade to 26.4.0.521 soon.

Data as of 29 Oct 2026, 10:21 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (qnap)CVSS 4.08.7
Patch
Available – fixed in 26.4.0.521, 26.4.1.563
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade HBS 3 Hybrid Backup Sync to 26.4.0.521; Hybrid Backup Sync to 26.4.1.563 or 26.4.0.521.

Affected software

ProductAffectedFixed in
QNAP Systems Inc.HBS 3 Hybrid Backup SyncAffected
  • >=26.4.x <26.4.0.521
Fixed in
  • 26.4.0.521
QNAP Systems Inc.Hybrid Backup SyncAffected
  • >=26.4.x <26.4.1.563
Fixed in
  • 26.4.1.563
QNAP Systems Inc.Hybrid Backup SyncAffected
  • >=26.4.x <26.4.0.521
Fixed in
  • 26.4.0.521

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

References

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