Security readout for executives and security teams
Plain-English summary
Adobe Substance 3D Modeler 1.22.4 and earlier can be compromised when a user opens a malicious file. Successful exploitation could let an attacker run code with that user’s permissions, potentially exposing or altering data and disrupting the workstation.
Executive priority
Prioritize remediation for creative teams and other users who exchange model files externally. The required user action reduces immediacy, but potential code execution and high confidentiality, integrity, and availability impact justify prompt treatment.
Technical view
CVE-2026-21298 is a CWE-787 out-of-bounds write vulnerability with CVSS 3.1 score 7.8. It requires local delivery and user interaction, needs no prior privileges, and may cause arbitrary code execution in the current user’s context, affecting confidentiality, integrity, and availability.
Likely exposure
Exposure is most likely on workstations running Substance 3D Modeler 1.22.4 or earlier, particularly where users open models from external, shared, or untrusted sources. Systems without the product, or outside the stated affected range, are not established as vulnerable by this bundle.
Exploitation context
A victim must open a malicious file, so exploitation is not described as remote or interaction-free. The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation. Lack of KEV listing does not prove exploitation is impossible or absent.
Researcher notes
The narrative says versions 1.22.4 and earlier are affected. The structured affected entry contains values “0” and “1.22.5” with default status unaffected, creating a range-format ambiguity. Validate exact version boundaries against Adobe APSB26-08. No exploit method, patch version, or observed campaign is established in the supplied text.
Mitigation direction
- Inventory Substance 3D Modeler installations and identify versions 1.22.4 or earlier.
- Consult Adobe advisory APSB26-08 and apply its current update guidance.
- Restrict opening Substance 3D files from unknown or untrusted sources until remediated.
- Use least-privilege user accounts to limit the impact of successful code execution.
Validation and detection
- Confirm installed Modeler versions through software inventory and endpoint management records.
- Verify remediated installations match the version recommended in Adobe advisory APSB26-08.
- Review endpoint telemetry for suspicious child processes or activity following Modeler file opens.
- Confirm controls warn about or block untrusted Substance 3D files where practical.
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-787: 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-2026-21298 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-modeler/apsb26-08.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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.