CVE-2026-26243 Arbitrary Folder Deletion in Qsync Central 5.0.0.5
A remote attacker with a user account can exploit a path traversal flaw in Qsync Central to read unexpected files or system data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-26243?
CVE-2026-26243 is a high-severity path traversal vulnerability in QNAP Systems Inc. Qsync Central, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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
Weakness: CWE-22
Which versions are affected by CVE-2026-26243?
How do I fix CVE-2026-26243?
No fix has been published for CVE-2026-26243 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-26243 being exploited?
There is no known exploitation of CVE-2026-26243 in the wild and no public exploit code.
Sources
Also known as GHSA-rh7w-pg72-6qph.