Substance 3D Sampler EUVD-2026-67082

Exploitation requires that a victim user actively open a specially crafted file within Adobe Substance 3D Sampler version 5.1.3 or earlier. The CVSS vector AV:L/UI:R confirms two concrete prerequisites: the malicious file must be present on the local system or a locally mounted path, and the victim must deliberately open it using the vulnerable application. No network-exposed service is involved, and no authentication to a remote system is required. Exploitation is limited to the privilege level of the current user (S:U), so the attacker gains only what that user account can access. Non-default configurations are not required - the vulnerability is present in normal file-open operations. Limiting factors include the mandatory human interaction step and the need to deliver and convince the target to open the weaponized file.

The CVSS 3.1 base score of 7.8 (High) reflects high confidentiality, integrity, and availability impact combined with low attack complexity, but the local attack vector (AV:L) and mandatory user interaction (UI:R) are meaningful constraints. Real-world exploitation requires social engineering to persuade a designer or artist to open a weaponized file - a realistic but not trivial barrier. No EPSS score was provided in the source data, which limits probabilistic exploitation forecasting; given the absence of KEV listing and public POC, opportunistic mass exploitation appears unlikely at this time. That said, creative-industry professionals routinely exchange project files through less-scrutinized channels (freelance platforms, asset marketplaces, Discord servers), so even a mid-sized studio with distributed artists should treat this as urgent patching work. The scope is unchanged (S:U), meaning a successful exploit is contained to the current user session and does not directly pivot to other systems - a partial mitigant in well-segmented environments. Overall risk priority is elevated for organizations with active Substance 3D Sampler deployments, but does not warrant emergency response absent KEV confirmation.

An attacker crafts a malicious Substance 3D Sampler project file embedding oversized data designed to overflow a heap buffer in the file parser, then delivers it to a target 3D artist via a phishing email, a compromised asset-sharing platform, or a poisoned freelance project package. When the victim opens the file in Substance 3D Sampler 5.1.3 or earlier, the parser writes beyond the allocated buffer, corrupts heap control structures, and redirects execution to attacker shellcode running with the full privileges of the logged-in user. No public proof-of-concept code has been identified at time of analysis, but the attack primitive - a heap overflow in a file parser - is well-understood and reproducible by skilled exploit developers.