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TI-2026-74699 Aliases CVE-2026-26243

Path traversal in QNAP Qsync Central lets attackers read files

Priority LOW 32CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

QNAP Qsync Central from 5.0.x before 5.0.0.6, from 5.1.x before 5.1.0.2 and from 5.2.x before 5.2.0.4 contains a path traversal flaw (CWE-22) that lets a user escape its restricted directory. A remote attacker who has gained a user account can read the contents of unexpected files or system data.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

A path traversal vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to read the contents of unexpected files or system data. We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.6 and later Qsync Central 5.1.0.2 and later Qsync Central 5.2.0.4 and later

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00419 36th percentileScored 2026-11-07
Fix Fixed Qsync Central (QNAP Systems Inc.): 5.0.0.6, 5.1.0.2, 5.2.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
QNAPQsync Central5.0.x to before 5.0.0.6; 5.1.x to before 5.1.0.2; 5.2.x to before 5.2.0.45.0.0.6, 5.1.0.2, 5.2.0.4Patch availableCNA
  • Qsync Central VendorQNAP Affected 5.0.x to before 5.0.0.6; 5.1.x to before 5.1.0.2; 5.2.x to before 5.2.0.4 Fixed in 5.0.0.6, 5.1.0.2, 5.2.0.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:qnap:qsync_central:*:*:*:*:*:*:*:*——QNAP
  • cpe:2.3:a:qnap:qsync_central:*:*:*:*:*:*:*:* Versions — — ·QNAP

Remediation

Update Qsync Central to 5.0.0.6 or later in the 5.0 branch, 5.1.0.2 or later in the 5.1 branch, or 5.2.0.4 or later in the 5.2 branch.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Qsync Central (QNAP Systems Inc.) Fixed in 5.0.0.6, 5.1.0.2, 5.2.0.4

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-26243

References

Other 1

  • TI-2022-10581 DeadBolt Ransomware KEVCVSS 3.1CRITICAL 10.0
  • TI-2021-09791 Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync) KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-02221 Command Injection Vulnerability in QTS and QuTS hero KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05103 Path traversal in QNAP NAS devices running Photo Station KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05102 Path traversal in QNAP NAS devices running Photo Station KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05101 Improper input validation in QNAP NAS devices KEVCVSS 3.1CRITICAL 9.8
See all 681 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences