Adobe Substance 3D Stager: Out-of-bounds write leads to code execution
Summary
Adobe Substance 3D Stager 3.1.8 and earlier on Windows and macOS contains an out-of-bounds write vulnerability (CWE-787). An attacker can execute arbitrary code in the context of the current user. Exploitation requires a victim to open a malicious file.
Affected
- Adobe Substance 3D Stager 3.1.8 and earlier (Windows and macOS)
Fixed in
- Adobe Substance 3D Stager 3.1.9 (Windows and macOS), released with APSB26-170 on October 13, 2026
Workaround
Unknown.
Exploitation
- Adobe is not aware of any exploits in the wild for the issues in APSB26-170.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- No public proof of concept was found.
Our recommendation
- Inventory Stager installations on Windows and macOS and identify versions 3.1.8 or earlier.
- Update to Stager 3.1.9 via the Creative Cloud desktop app or the Admin Console.
- Until patched, do not open Stager files from unknown or unverified senders.
- The update also covers 15 other Stager vulnerabilities in APSB26-170, so one update action addresses them all.
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 record CVE-2026-103832 vulners.com
- Strix CVE record CVE-2026-103832 www.strix.ai
- HKCERT Adobe security update October 2026 www.hkcert.org
- Zero Day Initiative October 2026 security update review www.zerodayinitiative.com
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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