Vulnerability in QNAP Hybrid Backup Sync
CVE-2025-62842
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
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (18.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- QNAP Hybrid Backup Sync
- QNAP Systems Inc. Hbs 3 Hybrid Backup Sync — versions 26.1.x
Weakness classification (CWE)
References
- www.qnap.com/en/security-advisory/qsa-25-46 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-62842?
- CVE-2025-62842 is a high-severity vulnerability in QNAP Hybrid Backup Sync, classified under External Control of File Name or Path. CVSS score: 7.8/10. Published 2026-01-02.
- How severe is CVE-2025-62842?
- High severity. CVSS v3 base score is 7.8 out of 10.