Review reviewHigh

CVE-2025-62842

QNAP Systems Inc. HBS 3 Hybrid Backup Sync, hybrid backup sync

An external control of file name or path vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If an attacker gains local network access, they can then exploit the vulnerability to read or modify files or directories. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.2.0.938 and later

CVSS: 7
EPSS: 0.23%
CISA KEV: Not listed
Published: 2026.01.03

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.23%

Technical severityCVSS 7

Vulnerability overview

Affected product and versions

Product: QNAP Systems Inc. HBS 3 Hybrid Backup Sync, hybrid backup sync
Affected versions: >= 26.1.x < 26.2.0.938, < 26.2.0.938
Fixed versions: 26.2.0.938

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that QNAP Systems Inc. HBS 3 Hybrid Backup Sync, hybrid backup sync and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-73