Low severity · published Jan 2, 2026
CVE-2025-62840
A generation of error message containing sensitive information vulnerability has been reported to affect HBS 3 Hybrid Backup Sync
3.3
CVSS
0.2%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HB
Hybrid Backup Sync · Qnap
before 26.2.0.938 · source: NVD
In the news
VulnerabilityMedium
ZDI-26-242: (Pwn2Own) QNAP TS-453E server_handlers.pyc rr2s.kwargs Error Message Information Disclosure Vulnerability
This vulnerability allows network-adjacent attackers to disclose sensitive information on affected installations of QNAP TS-453E devices. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The ZDI has assigned a CVSS rating of 3.5. The following CVEs are assigned: CVE-2025-62840.
Mar 30, 2026·Zero Day Initiative
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-62840
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-62840
Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-25-46
More from Hybrid Backup Sync
9.8
CVE-2021-28799
Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)
9.8
CVE-2024-50388
An OS command injection vulnerability has been reported to affect HBS 3 Hybrid Backup Sync
9.8
CVE-2021-28809
An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3
9.1
CVE-2024-53695
A buffer overflow vulnerability has been reported to affect HBS 3 Hybrid Backup Sync
7.8
CVE-2025-62842
An external control of file name or path vulnerability has been reported to affect HBS 3 Hybrid Backup Sync