CVE-2026-6421 Mobatek MobaXterm Home Edition msimg32.dll uncontrolled search path
Local attackers can exploit an uncontrolled search path in msimg32.dll to execute arbitrary code, requiring high complexity and local access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6421?
CVE-2026-6421 is a high-severity vulnerability in Mobatek MobaXterm Home Edition, published on 17 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been found in Mobatek MobaXterm Home Edition up to 26.1. This affects an unknown part in the library msimg32.dll. The manipulation leads to uncontrolled search path. An attack has to be approached locally. The attack is considered to have high complexity. It is indicated that the exploitability is difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 26.2 is able to mitigate this issue. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Which versions are affected by CVE-2026-6421?
How do I fix CVE-2026-6421?
No fix has been published for CVE-2026-6421 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-6421 being exploited?
There is no known exploitation of CVE-2026-6421 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-hf75-j846-hmxr.