Security readout for executives and security teams
Plain-English summary
A malicious file opened in Adobe Substance 3D Stager can exploit a memory-handling flaw and run code with the victim’s account permissions. This could expose or alter data and disrupt the workstation. The victim must open the file, so exposure depends on both affected software and successful file delivery.
Executive priority
Treat this as a high-priority workstation remediation, especially for creative teams handling external files. Prioritize inventory and updating over emergency incident response unless suspicious activity is observed, because exploitation requires user interaction and active exploitation is not established by the supplied sources.
Technical view
CVE-2026-27309 is a use-after-free vulnerability (CWE-416) in Substance 3D Stager 3.1.7 and earlier. It enables arbitrary code execution as the current user after opening a malicious file. CVSS 3.1 is 7.8: local attack vector, low complexity, no privileges required, user interaction required, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Workstations running Substance 3D Stager 3.1.7 or earlier are potentially exposed, particularly where users receive and open files from external or untrusted sources. Systems without Stager, or outside the stated affected range, are not identified as affected by the supplied sources.
Exploitation context
Exploitation requires a victim to open a malicious file; remote, interaction-free compromise is not described. The source bundle does not identify this CVE as KEV-listed and provides no evidence of active exploitation. Absence from KEV does not prove exploitation has never occurred.
Researcher notes
The vulnerability is memory corruption caused by use-after-free behavior. Successful exploitation can achieve code execution with current-user privileges, without prior attacker authentication. The supplied material does not provide root cause details, file formats, exploit reliability, indicators of compromise, or an explicitly named corrected release; consult Adobe’s advisory for authoritative remediation details.
Mitigation direction
- Inventory Substance 3D Stager installations and prioritize systems running version 3.1.7 or earlier.
- Follow Adobe’s advisory and update affected installations beyond the documented vulnerable versions.
- Until updated, prevent affected installations from opening files received from untrusted or unexpected sources.
- Use existing endpoint protections to limit and detect unexpected processes launched from Stager.
Validation and detection
- Confirm installed Stager versions through endpoint inventory and compare them with the affected range.
- Verify updated endpoints no longer run Substance 3D Stager 3.1.7 or earlier.
- Confirm affected users understand that unexpected Stager-compatible files should not be opened.
- Review endpoint telemetry for unusual child processes or activity associated with Stager.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27309 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9adobeVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/substance3d_stager/apsb26-29.htmlCVE reference, adobe · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.