CVE-2026-9127
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA remote code execution security issue exists within Studio 5000 Logix Designer® due to incorrect authorization on a configuration file. This can allow any authenticated user to modify the paths of external tools configured within the application. If exploited, an attacker could alter the configuration to point to a malicious executable, resulting in arbitrary code execution when any user interacts with the external tools functionality.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceStudio 5000 Logix Designer contains a remote code execution vulnerability where incorrect authorization on a configuration file allows any authenticated user to modify paths of external tools. An attacker can alter the configuration to point to a malicious executable, achieving arbitrary code execution when users invoke the external tools functionality.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- High
- Privileges
- Low
- Authentication
- X
- User interaction
- A
- Scope
- X
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Studio 5000 Logix Designer installationCheck for the product in the Windows Programs and Features list (appwiz.cpl) or search for 'Logix Designer' in the application menuAffected if The product is installed and no authorization controls exist on its configuration files
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Determine the installed versionOpen Studio 5000 Logix Designer and navigate to Help > About, or check the version in Add/Remove ProgramsAffected if Version cannot be verified or falls within an affected release range
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Locate external tools configuration filesSearch for configuration files related to external tools in the Studio 5000 installation directory, typically under the user or application data folders (e.g., %APPDATA%\Rockwell\ or %PROGRAMDATA%\Rockwell\)Affected if Configuration files exist and are modifiable by authenticated users without proper authorization checks
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Verify file permissions on external tool configurationRight-click the identified configuration files, go to Properties > Security, and review which user groups have Write or Modify permissionsAffected if Non-administrative users or standard authenticated users have Write or Modify permissions on these files
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Confirm external tools feature is in useCheck if external tools have been configured within Logix Designer (Tools > External Tools or similar menu option) and note any custom executable paths definedAffected if External tools are configured and point to executable files that could be replaced by an attacker
A defender is affected if Studio 5000 Logix Designer is installed and authenticated users (non-administrators) can modify external tool configuration files that control executable paths.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement proper authorization checks on the configuration file and validate external tool executable paths to prevent modification by unprivileged users. Restrict external tool configuration to administrative roles only.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9127 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-9127 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data