CVE-2025-62840

Application-data disclosure via sensitive error messages

Published Jan 2, 2026 · Updated Jan 2, 2026

Sensitive-information exposure in QNAP Hybrid Backup Sync before 26.2.0.938 allows remote attackers on the local network to read application data. QNAP has not disclosed the request or error-handling path that places sensitive application data in an error message. Exploitation requires access to the NAS's local network and exposes application data, with no published evidence of file modification or service interruption.

CVSS severity7.0
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-information exposure in QNAP Hybrid Backup Sync before 26.2.0.938 allows remote attackers on the local network to read application data. QNAP has not disclosed the request or error-handling path that places sensitive application data in an error message. Exploitation requires access to the NAS's local network and exposes application data, with no published evidence of file modification or service interruption.

The record

CVE
CVE-2025-62840
Published
Jan 2, 2026
Updated
Jan 2, 2026
Vendor
Linn Products Limited
Product
Hybrid Backup Sync
Classifications
CWE-209, T1005
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=26.1.x <26.2.0.938

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Linn Products Limited · Hybrid Backup Syncversion=26.1.x <26.2.0.938

Published CVSS scores

3.3NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
7.0QNAP Systems, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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