CVE-2026-9128
HIGHDescription
A code execution security issue exists within Studio 5000 Logix Designer® due to an unquoted search path in the External Tools configuration. The executable paths specified in the external tools configuration file are not properly quoted, and because these paths contain spaces, the operating system may resolve them to unintended executables placed earlier in the search order. If exploited, an attacker could plant a malicious executable in a location within the search path, resulting in arbitrary code execution with the same permissions of the user running the application.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 2% of all known CVEs.
References
Related Vulnerabilities
Other CWE-428 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-38408 | Critical | 9.8 | 80% | - | Fix |
| CVE-2020-15261 | High | 8.0 | 11% | - | Fix |
| CVE-2017-13993 | High | 7.8 | 2.6% | - | - |
| CVE-2018-10619 | High | 7.8 | 2.6% | - | Fix |
| CVE-2019-17658 | Critical | 9.8 | 2.2% | - | - |
| CVE-2015-4173 | Medium | 6.9 | 2.1% | - | Fix |
Common questions
How do I fix CVE-2026-9128?
Upgrade studio 5000 logix designer to 33.03 or later.
Is CVE-2026-9128 being actively exploited?
Not that we know of. CVE-2026-9128 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.12% is the estimated probability that it will be exploited in the next 30 days. That is higher than 2% of all scored CVEs.
How severe is CVE-2026-9128?
CVE-2026-9128 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-9128 affect?
Published advisories record a fix for studio 5000 logix designer (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-25.