Security readout for executives and security teams
Plain-English summary
A malicious file opened in Adobe Dreamweaver could cause attacker-controlled commands to run on the victim’s computer. Successful exploitation could expose data, alter files, or disrupt the system. The victim must open the file, so phishing or other file-delivery scenarios are the primary concern.
Executive priority
Treat as a high-priority endpoint remediation issue. Prioritize creative, web-development, and contractor systems that routinely exchange external files. The user-interaction requirement reduces immediacy compared with an unauthenticated remote flaw, but arbitrary code execution and full impact across confidentiality, integrity, and availability justify prompt action.
Technical view
CVE-2026-21267 is an OS command injection vulnerability in Dreamweaver Desktop 21.6 and earlier. It may permit arbitrary code execution without prior privileges, but requires local access through user interaction. The CVSS 3.1 score is 8.6, with high confidentiality, integrity, and availability impact and changed scope.
Likely exposure
Endpoints running Dreamweaver Desktop 21.6 or earlier are potentially exposed, particularly where users receive or open files from external or untrusted sources. Systems without Dreamweaver are not affected. The supplied evidence does not identify specific operating systems or deployment configurations that alter exposure.
Exploitation context
Exploitation requires a victim to open a malicious file. The attack is rated low complexity and requires no attacker privileges, but it is not remote without user involvement. The source bundle marks the CVE as absent from KEV and provides no evidence of active exploitation or a public exploit.
Researcher notes
The weakness is classified as CWE-78. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H. Available evidence establishes file-triggered command injection and arbitrary code execution, but does not describe the vulnerable command path, affected operating systems, exploit availability, indicators of compromise, or exploitation in the wild.
Mitigation direction
- Inventory Dreamweaver installations and prioritize systems running version 21.6 or earlier.
- Consult Adobe advisory APSB26-01 and apply the vendor-recommended update.
- Restrict or discourage opening unsolicited Dreamweaver-compatible files until remediation is complete.
- Use endpoint controls to monitor and block suspicious processes launched by Dreamweaver.
Validation and detection
- Confirm installed Dreamweaver versions through endpoint management or software inventory records.
- Verify remediated endpoints no longer run version 21.6 or earlier.
- Review security telemetry for unusual processes launched by Dreamweaver after opening external files.
- Confirm users handling external files received appropriate awareness guidance.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter 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 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-2026-21267 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
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/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:C/C:H/I:H/A:H1.86adobeVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/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/dreamweaver/apsb26-01.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 Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.