CVE-2026-14818 Path traversal in ATP series firmware
An authenticated administrator can exploit a path traversal flaw in the CLI to execute malicious configuration files on Zyxel firewalls.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-14818?
CVE-2026-14818 is a high-severity path traversal vulnerability in Zyxel ATP series firmware, published on 4 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A path traversal vulnerability in the CLI command used to execute configuration files in Zyxel ATP series firmware versions from V4.32 through V5.42 Patch 1, USG FLEX series firmware versions from V4.50 through V5.42 Patch 1, USG FLEX 50(W) series firmware versions from V4.16 through V5.42 Patch 1, and USG20(W)-VPN series firmware versions from V4.16 through V5.42 Patch 1 could allow an authenticated attacker with administrator privileges to execute a crafted malicious configuration file on an affected device.
Weakness: CWE-22
Which versions are affected by CVE-2026-14818?
How do I fix CVE-2026-14818?
No fix has been published for CVE-2026-14818 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-2026-14818 being exploited?
There is no known exploitation of CVE-2026-14818 in the wild and no public exploit code.
Sources
Also known as GHSA-75p7-jv3w-pjpc.