CVE-2026-21287
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 · uneditedSubstance3D - Stager versions 3.1.5 and earlier are affected by a Use After Free vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
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 confidenceA Use After Free vulnerability in Adobe Substance3D Stager versions 3.1.5 and earlier allows arbitrary code execution when a victim opens a malicious file. The vulnerability exploits memory that has been deallocated but is still being accessed, potentially enabling an attacker to execute arbitrary code with the privileges of the current user.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 3.1.6CVSS 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
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 if Adobe Substance3D Stager is installedCheck for the application in the system program files directory (typically C:\Program Files\Adobe\Adobe Substance 3D Stager) or look for the application entry in Windows Registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\UninstallAffected if The application is present on the system
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Determine the installed version numberOpen the application and navigate to Help > About Adobe Substance3D Stager, or check the version in the application executable properties (right-click the .exe file and view Details), or query the Windows Registry for the version stringAffected if The displayed version is 3.1.5 or any version number lower than 3.1.6
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Verify the file open functionality is accessibleConfirm the application can normally open and load 3D scene files (this is the attack vector for the vulnerability)Affected if The application is installed and functional, allowing users to open files - which is the normal behavior that triggers the vulnerability
A user is affected if Adobe Substance3D Stager version 3.1.5 or earlier is installed and the application can open files, since the Use After Free vulnerability triggers when opening a malicious file.
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.
dbcve · scoped3.1.6
Update Substance3D Stager to a patched version once released by Adobe. Avoid opening untrusted or unsolicited files, and implement application allowlisting to reduce the attack surface.
Substance 3D Stager 3.1.6
- Navigate to the Adobe Creative Cloud desktop application or the Substance 3D Stager application
- Check for available updates or navigate to the application's help menu
- Select 'Check for Updates' or navigate to Adobe's official download page for Substance 3D Stager
- Download and install Substance 3D Stager version 3.1.6 or later
- Restart the application after installation to ensure the update is fully applied
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,880.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-21287 — 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-2026-21287 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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- 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