Security readout for executives and security teams
Plain-English summary
A malicious Substance 3D Designer file can cause the application to read sensitive files outside its intended folders. An attacker must persuade a user to open the file. The reported impact is confidentiality loss; the sources do not identify file modification or service disruption.
Executive priority
Prioritize remediation for designers who handle external files or work on endpoints containing sensitive information. Treat this as a focused confidentiality risk rather than an organization-wide emergency unless affected installations are widespread or exposed users hold privileged data.
Technical view
CVE-2026-34664 is a CWE-22 path-traversal vulnerability reported in Substance 3D Designer 15.1.0 and earlier. It permits arbitrary filesystem reads through a malicious file opened locally by a victim. CVSS 3.1 is 6.3, with changed scope, high confidentiality impact, and no stated integrity or availability impact.
Likely exposure
Exposure is most likely on workstations running Substance 3D Designer 15.1.0 or earlier, particularly where users open project files from external, shared, or untrusted sources. Systems containing valuable credentials, intellectual property, or customer data warrant faster attention.
Exploitation context
Exploitation requires user interaction: a victim must open a malicious file. The bundle reports no privileges required and low attack complexity. This CVE is not listed in KEV, and the supplied sources provide no evidence of active exploitation or a public exploit.
Researcher notes
The supplied description clearly states that versions 15.1.0 and earlier are affected. However, the structured affected-version entry also contains 16.0.1 with a default status of unaffected, creating ambiguity. Confirm precise version boundaries and the corrected release directly against Adobe APSB26-52. No active exploitation evidence is supplied.
Mitigation direction
- Inventory Substance 3D Designer installations and identify versions 15.1.0 or earlier.
- Consult Adobe advisory APSB26-52 and install the vendor-designated corrected release.
- Block or quarantine untrusted Substance project files until affected installations are remediated.
- Limit sensitive files and credentials accessible from Designer user accounts.
Validation and detection
- Confirm installed Designer versions through software inventory and endpoint records.
- Verify remediated systems match the corrected release identified in Adobe APSB26-52.
- Review file-opening telemetry for Designer files received from external or untrusted sources.
- Check endpoint alerts for unusual Designer access to sensitive files outside normal project directories.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-34664 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
- Medium
- CVSS
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
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:C/C:H/I:N/A:N1.84adobeVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
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_designer/apsb26-52.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.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.