Adobe Substance 3D Stager: Out-of-bounds write allows code execution
Summary
Adobe Substance 3D Stager contains an out-of-bounds write vulnerability (CWE-787). An attacker can execute arbitrary code with the rights of the current user. Exploitation requires that a victim opens a malicious file, for example a crafted 3D project file. The CVSS base score is 7.8 (high).
Affected
- Adobe Substance 3D Stager 3.1.8 and earlier, Windows and macOS (per CVE record and Adobe bulletin APSB26-170)
- Note: the bulletin excerpt reviewed does not show a row for CVE-2026-103833; verify the exact mapping in the bulletin table.
Fixed in
- Adobe Substance 3D Stager 3.1.9 or later
Workaround
- No vendor-published workaround. Update to 3.1.9 or later.
- Until patched, do not open 3D project files from untrusted sources.
Exploitation
- Adobe is not aware of any exploits in the wild for the issues in APSB26-170.
- CISA SSVC: exploitation none, not automatable.
- No public proof of concept found in the research; this does not prove none exists.
Our recommendation
- Update Substance 3D Stager to 3.1.9 or later via the Creative Cloud desktop app or the Admin Console on Windows and macOS endpoints.
- Until the update is installed, only open 3D project files from trusted sources.
- Check the bulletin table to confirm the CVE mapping and the installed version on each workstation.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Adobe Security Bulletin APSB26-170 www.adobe.com
- Vulners: CVE-2026-103833 vulners.com
- CVE-2026-103833 (threatint) cve.threatint.com
- Strix: CVE-2026-103833 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 2 Nov 2026, 00:18.
Original description (NVD)
Substance3D - Stager is affected by an out-of-bounds write 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.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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