Vulnerability · Published Sep 17, 2026 · Assigned by Mitsubishi

CVE-2026-15688Password Authentication Bypass Vulnerability in GX Works3 and Motion Control Setting

Critical 9.2

In plain English

A critical-severity security flaw in GX Works3 from Mitsubishi Electric Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 4.0)9.2Critical

Exploit odds (30 days)0.2%top 92.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Mitsubishi Electric Corporation	GX Works3	All versions
Mitsubishi Electric Corporation	Motion Control Setting	All versions

Weakness: CWE-303 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:H

References

https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2026-007_en.pdf vendor-advisory
https://jvn.jp/vu/JVNVU99700314 government-resource
https://www.cisa.gov/news-events/ics-advisories/icsa-26-260-02 government-resource