High severity · published Oct 15, 2026
CVE-2026-26243
Arbitrary Folder Deletion in Qsync Central 5.0.0.5
7.2
CVSS
0.4%
EPSS
No
On KEV
Description
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
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QC
Qsync Central · QNAP Systems Inc.
5.0.x before 5.0.0.6; 5.1.x before 5.1.0.2; 5.2.x before 5.2.0.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26243
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26243
www.qnap.com
https://www.qnap.com/en/app-release-notes?keyword=Qsync%20&app=QsyncServer&product-line=nas
More from Qsync Central
5.3
CVE-2026-41541
Symlink creation in qsyncsrv.cgi
5.3
CVE-2026-24718
Path Traversal Vulnerability in Qsync Central's qsyncsrv.cgi
2.3
CVE-2025-29897
Stack-based Buffer Overflow in qsyncsrv.cgi
2.3
CVE-2025-29896
NULL Pointer Dereference in qsyncsrv.cgi
2.3
CVE-2025-29895
NULL Pointer Dereference in qsyncsrv.cgi
