CVE-2026-15688 Password Authentication Bypass Vulnerability in GX Works3 and Motion Control Setting
A local attacker can bypass block password authentication in Mitsubishi GX Works3 by modifying memory, allowing unauthorized access to control programs.
- 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-2026-15688?
CVE-2026-15688 is a critical authentication bypass vulnerability in Mitsubishi Electric Corporation GX Works3, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Incorrect Implementation of Authentication Algorithm Vulnerability in Mitsubishi Electric GX Works3 and Motion Control Setting allows a local attacker to successfully authenticate even with an invalid block password by executing the affected product and modifying part of the executable module in memory, and thereby may be able to view, tamper with, destroy, or delete control programs.
Weakness: CWE-303
Which versions are affected by CVE-2026-15688?
How do I fix CVE-2026-15688?
No fix has been published for CVE-2026-15688 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-15688 being exploited?
There is no known exploitation of CVE-2026-15688 in the wild and no public exploit code.
Sources
Also known as GHSA-x4hf-m6gp-2m3x.