Advisories › Mitsubishi Electric › ICSA-26-260-02
Mitsubishi Electric GX Works3 and Motion Control Settings: 1 CVE, High 8.8
Summary
CISA reports 1 vulnerability in Mitsubishi Electric Mitsubishi Electric GX Works3, Mitsubishi Electric Motion Control Settings (Software packaged with GX Works3). Weakness type: Incorrect Implementation of Authentication Algorithm. Successful exploitation of this vulnerability could allow a local attacker to successfully authenticate even with an invalid block password by executing the affected product and modify part of the executable module in memory, and thereby allows the attacker to view, tamper with, destroy, or delete… Highest CVSS v3 score: 8.8 (High), not remotely exploitable per its CVSS vector.
What to do: Prioritize: For customers using GX Works3, please download version 1.096A or later from the link…
Why this matters for oil & gas: Mitsubishi Electric PLCs/ICONICS SCADA are used in some oil & gas facilities.
At a glance
- Vendor
- Mitsubishi Electric
- Products
- Mitsubishi Electric GX Works3, Mitsubishi Electric Motion Control Settings (Software packaged with GX Works3)
- CVEs
- CVE-2026-15688
- Highest CVSS v3
- 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Highest CVSS v4
- –
- Known exploited (KEV)
- No CVE from this advisory is on the KEV list as of the last refresh
- Sectors (per CISA)
- Critical Manufacturing
- Deployed
- Worldwide
- Vendor HQ
- Japan
Vulnerabilities
| CVE | Weakness | CVSS v3 | CVSS v4 | KEV | Description (from advisory) |
|---|---|---|---|---|---|
| CVE-2026-15688 | Incorrect Implementation of Authentication Algorithm | 8.8 | – | No | Incorrect Implementation of Authentication Algorithm (CWE-303) vulnerability in the affected products allows a local attacker to successfully authenticate even with an invalid block password by executing the affected product and modify part of the executable module in memory, and thereby allows the attacker to view, tamper with, destroy, or delete control programs. |
Affected products (2)
- Mitsubishi Electric GX Works3: vers:all/*
- Mitsubishi Electric Motion Control Settings (Software packaged with GX Works3): vers:all/*
Vendor fixes and mitigations (from advisory)
- Workaround: For customers using GX Works3, please download version 1.096A or later from the link https://www.mitsubishielectric.com/fa/download/software/detailsearch.page?mode=software&kisyu=/plceng&shiryoid=1000001411&lang=2&select=0&softid=1&infostatus=1_2_1&viewradio=0&viewstatus=&viewpos=, install it, and set the security version for projects to "2". Please refer to “15.9 Preventing Illegal Access to/Falsification of Data (Security Version)” in “GX Works3 Operating Manual” for details. For more information about the workaround, refer to the Mitsubishi Electric security advisory available at "https://w link
- Workaround: For customers using Motion Control Settings (Software packaged with GX Works3), Please download version 1.070Y or later from the link "https://www.mitsubishielectric.com/fa/download/software/detailsearch.page?mode=software&kisyu=/ssc&shiryoid=1000000803&lang=2&select=0&softid=1&infostatus=1_8_1&viewradio=0&viewstatus=&viewpos=", install it, and set the security version for projects to "2". Please refer to “12.5 Preventing Illegal Access to/Falsification of Data (Security Version)” in “Motion Control Setting Function Help” for details. For more information about the workaround, refer to the Mit link
- Mitigation: For customers of the affected products, Mitsubishi Electric recommends using a computer with the affected product within a LAN and blocking remote logins from untrusted networks, hosts, and users, to minimize the risk of exploiting this vulnerability.
- Mitigation: For customers of the affected products, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc., to prevent unauthorized access, and allowing remote login only to trusted users when connecting a computer with the affected product to the Internet, to minimize the risk of exploiting this vulnerability.
- Mitigation: For customers of the affected products, Mitsubishi Electric recommends preventing the user from clicking on web links contained in emails or other messages from untrusted sources, or from opening attachments in untrusted emails, to minimize the risk of exploiting this vulnerability.
- Mitigation: For customers of the affected products, Mitsubishi Electric recommends installing antivirus software on a computer running the affected product, to minimize the risk of exploiting this vulnerability.
- Mitigation: For customers of the affected products, Mitsubishi Electric recommends restricting physical access to a computer on which the affected product is installed, as well as to computers and network devices that can communicate with it, to minimize the risk of exploiting this vulnerability.
Also apply CISA's standard ICS practices: minimize network exposure, keep control networks behind firewalls and isolated from business networks, and use up-to-date secure remote access.
Sources
- CISA advisory ICSA-26-260-02
- Machine-readable CSAF record
- https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2026-007_en.pdf
This page is generated automatically from the CISA advisory text. It is not a substitute for the vendor's guidance; verify affected versions and fixes at the source before making changes to control systems.