CVE-2025-62840 HBS 3 Hybrid Backup Sync
An attacker with local network access can read application data via sensitive information in error messages in QNAP HBS 3 Hybrid Backup Sync.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-62840?
CVE-2025-62840 is a high-severity vulnerability in QNAP Systems Inc. HBS 3 Hybrid Backup Sync, published on 2 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A generation of error message containing sensitive information 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 application data.
We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.2.0.938 and later
Weakness: CWE-209
Which versions are affected by CVE-2025-62840?
It affects 1 product.
Products include Qnap Hybrid Backup Sync.
How do I fix CVE-2025-62840?
No fix has been published for CVE-2025-62840 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-62840 being exploited?
There is no known exploitation of CVE-2025-62840 in the wild and no public exploit code.
Other vulnerabilities in QNAP Systems Inc. HBS 3 Hybrid Backup Sync
Sources
Also known as GHSA-fxxr-j78f-xmmm.