CVE-2026-12339 Authenticated Arbitrary File Write Vulnerability in multiple devices
Authenticated administrators can overwrite arbitrary system files via Zip Slip in the WebUI ISP upgrade, compromising integrity and availability.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12339?
CVE-2026-12339 is a medium-severity path traversal vulnerability in TP-Link Systems Inc. Archer MR200 v7, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Zip Slip vulnerability in the WebUI ISP Upgrade functionality allows arbitrary file write via a crafted archive containing directory traversal sequences. An authenticated administrator may overwrite arbitrary files on the system.Successful exploitation may allow arbitrary file to be overwritten on the underlying system, affecting system integrity and availability.
Weakness: CWE-22
Which versions are affected by CVE-2026-12339?
How do I fix CVE-2026-12339?
No fix has been published for CVE-2026-12339 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-2026-12339 being exploited?
There is no known exploitation of CVE-2026-12339 in the wild and no public exploit code.
Sources
Also known as GHSA-www9-662g-pffv.