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Mitsubishi Electric GX Works3 and Motion Control Settings

CISA warns CVE-2026-15688 lets a local attacker bypass block password authentication in Mitsubishi Electric GX Works3 and tamper with control programs.

CISA republished Mitsubishi Electric advisory 2026-007 describing CVE-2026-15688, an incorrect implementation of the authentication algorithm (CWE-303) in GX Works3 and the bundled Motion Control Settings, affecting all versions. A local attacker can authenticate with an invalid block password, modify an executable module in memory, and view, tamper with, destroy, or delete control programs. CVSS v3.1 base score is 8.8 (v4.0: 9.2), and CISA recommends isolating control system networks and minimizing internet exposure.

CISA Advisories · 1d agoAdvisory 2 sourcesCVE-2026-15688

Related CVEs

  • CVE-2026-156889.2—
    Block password bypass in Mitsubishi Electric GX Works3 and Motion Control Setting
    Mitsubishi Electric's GX Works3 and Motion Control Setting engineering software implement the block password feature incorrectly (CWE-303), so authentication succeeds even with an invalid password. A local attacker with low privileges who can execute the affected software can modify part of the executable module in memory to bypass the password check. Once bypassed, the attacker can view, tamper with, destroy, or delete PLC control programs that the password was meant to protect. Any organization running the affected software on engineering workstations with access to MELSEC PLC environments is affected, since the attack requires only local access to the workstation. No public proof-of-concept or in-the-wild exploitation is known, and the issue is not listed in CISA KEV.
    · Mitsubishi Electric GX Works3 · Mitsubishi Electric Motion Control Settinglarge

Appears with

organization CISA 1organization Mitsubishi Electric 1product GX Works3 1vendor CISA 1vendor Mitsubishi Electric 1
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