CVE-2026-47909 Overview
CVE-2026-47909 affects Adobe Dreamweaver Desktop versions 21.7 and earlier. The flaw is an improper input validation issue [CWE-20] that permits arbitrary file system read. An attacker who convinces a user to open a malicious file can read sensitive files and directories outside the application's intended access scope. The attack requires local access and user interaction, and the CVSS scope is changed because the impact crosses the security boundary of the Dreamweaver process.
Critical Impact
A successful attack discloses high-confidentiality data from outside Dreamweaver's authorized access scope, exposing local files accessible to the running user.
Affected Products
- Adobe Dreamweaver Desktop 21.7
- Adobe Dreamweaver Desktop versions earlier than 21.7
- Workstations where users open untrusted Dreamweaver project files
Discovery Timeline
- 2026-06-09 - CVE-2026-47909 published to the National Vulnerability Database (NVD)
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-47909
Vulnerability Analysis
Dreamweaver Desktop fails to properly validate input when parsing user-supplied files. The defect falls under Improper Input Validation [CWE-20]. An attacker constructs a malicious project, template, or resource file that, once opened in Dreamweaver, instructs the application to dereference paths outside the expected working scope. The result is arbitrary file system read, allowing the attacker to exfiltrate configuration files, credentials, or other sensitive content stored on the local host. The Adobe Security Advisory APSB26-62 confirms the issue and tracks the fixed release.
Root Cause
The root cause is missing or insufficient validation of file path or reference inputs supplied through a Dreamweaver document. Without canonicalization and scope enforcement, the parser resolves attacker-controlled references and returns file content from arbitrary locations accessible to the user account running Dreamweaver.
Attack Vector
Exploitation is local and requires user interaction. The attacker delivers a crafted Dreamweaver file via email, messaging, web download, or shared storage. When the victim opens the file, Dreamweaver processes the malicious input and reads files outside its intended scope. Because the CVSS scope is changed, the disclosed data can include resources owned by components other than Dreamweaver itself. No privileged credentials are required from the attacker, but no integrity or availability impact occurs.
No verified public proof-of-concept code is available. Refer to the Adobe Security Advisory APSB26-62 for vendor-confirmed technical details.
Detection Methods for CVE-2026-47909
Indicators of Compromise
- Dreamweaver process accessing files outside expected project directories, such as %USERPROFILE%\.ssh, browser credential stores, or system configuration paths.
- Recently opened Dreamweaver files originating from email attachments, untrusted downloads, or external shares.
- Unexpected file read events generated by Dreamweaver.exe shortly after a document open event.
Detection Strategies
- Monitor endpoint telemetry for Dreamweaver.exe reading sensitive paths unrelated to the current project workspace.
- Correlate document-open events with subsequent file access patterns to flag traversal-style behavior.
- Apply file reputation and content inspection to Dreamweaver project files received from external sources.
Monitoring Recommendations
- Forward endpoint file access and process telemetry into a centralized analytics platform for retention and correlation.
- Alert on Dreamweaver reads of credential stores, SSH keys, browser profile data, and OS configuration files.
- Track Dreamweaver version inventory to identify hosts still running 21.7 or earlier.
How to Mitigate CVE-2026-47909
Immediate Actions Required
- Update Adobe Dreamweaver Desktop to the version specified in Adobe Security Advisory APSB26-62.
- Instruct users not to open Dreamweaver project files received from untrusted or unverified sources.
- Inventory endpoints to identify systems running vulnerable versions 21.7 or earlier.
Patch Information
Adobe addresses CVE-2026-47909 in the update referenced by advisory APSB26-62. Administrators should deploy the fixed Dreamweaver Desktop release through Adobe Creative Cloud or enterprise software distribution channels and confirm the installed build matches or exceeds the patched version.
Workarounds
- Restrict Dreamweaver to opening files from trusted, controlled project directories only.
- Run Dreamweaver under a least-privilege user account to limit which files are readable on disk.
- Use application allowlisting and email gateway filtering to block delivery of unsolicited Dreamweaver project files.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
