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PatchSiren cyber security CVE debrief

CVE-2025-62842 Qnap CVE debrief

CVE-2025-62842 is an external control of file name or path vulnerability affecting HBS 3 Hybrid Backup Sync. If an attacker gains local network access, they can exploit the vulnerability to read or modify files or directories. The vulnerability has been fixed in HBS 3 Hybrid Backup Sync version 26.2.0.938 and later. This issue is considered high severity with a CVSS score of 7. Administrators and users should be aware of this vulnerability and take necessary actions to protect their systems.

Vendor
Qnap
Product
Hybrid Backup Sync
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-02
Original CVE updated
2026-07-25
Advisory published
2026-01-02
Advisory updated
2026-07-25

Who should care

Administrators and users of HBS 3 Hybrid Backup Sync should be aware of this vulnerability and take necessary actions to protect their systems. This includes updating to the latest version, restricting local network access, and monitoring system logs for suspicious activity. Operators, platform administrators, and security teams should review the vulnerability details and assess their exposure.

Technical summary

The vulnerability is caused by an external control of file name or path issue in HBS 3 Hybrid Backup Sync. An attacker with local network access can exploit this vulnerability to read or modify files or directories. The CVSS score for this vulnerability is 7, indicating a high severity level. The vulnerability was reported to affect HBS 3 Hybrid Backup Sync and has been fixed in version 26.2.0.938 and later.

Defensive priority

High

Recommended defensive actions

  • Update HBS 3 Hybrid Backup Sync to version 26.2.0.938 or later
  • Restrict local network access to the system
  • Monitor system logs for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability was reported to affect HBS 3 Hybrid Backup Sync. The CVE record was published on 2026-01-02T16:17:00.710Z and was last modified on 2026-07-25T11:10:00.100Z. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify the affected product deployments and review official advisories for mitigation guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-62842 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-62842

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-62842 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-62842

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.