CVE-2026-21267 is an OS command injection vulnerability classified under CWE-78, affecting Adobe Dreamweaver Desktop versions 21.6 and earlier. The flaw stems from improper neutralization of special elements in OS commands, which allows an attacker to inject and execute arbitrary commands on the underlying operating system. The attack vector requires user interaction, specifically the victim opening a crafted malicious file within Dreamweaver. This interaction triggers the injection, enabling the attacker to escalate privileges or execute arbitrary code with the victim's user permissions. The vulnerability's scope is changed, indicating that the impact extends beyond the vulnerable component, potentially affecting the entire system's confidentiality, integrity, and availability. The CVSS 3.1 base score is 8.6 (high severity), with vector AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H, meaning the attack requires local access and user interaction but no privileges, and it can cause high impact on confidentiality, integrity, and availability with scope change. Although no known exploits are reported in the wild yet, the vulnerability poses a significant risk due to the widespread use of Adobe Dreamweaver in web development environments. The absence of a patch link suggests that Adobe may not have released an official fix at the time of this report, emphasizing the need for interim mitigations.

For European organizations, this vulnerability presents a critical risk, particularly for those relying on Adobe Dreamweaver for web development and digital content creation. Successful exploitation can lead to arbitrary code execution, allowing attackers to compromise sensitive data, alter or destroy files, and disrupt business operations. The high impact on confidentiality, integrity, and availability means that intellectual property, client data, and operational continuity could be severely affected. Given the requirement for user interaction, phishing or social engineering campaigns could be leveraged to deliver malicious files, increasing the attack surface. Organizations in sectors such as media, advertising, software development, and education are especially vulnerable. Additionally, compromised systems could serve as entry points for broader network intrusions, lateral movement, or ransomware deployment, amplifying the threat landscape in European enterprises.

1. Monitor Adobe's official channels for patches and apply updates to Dreamweaver Desktop immediately upon release. 2. Until patches are available, restrict the opening of files from untrusted or unknown sources within Dreamweaver. 3. Implement strict email filtering and user awareness training to reduce the risk of phishing attacks delivering malicious files. 4. Employ endpoint detection and response (EDR) solutions capable of identifying suspicious command injection behaviors and blocking unauthorized OS command executions. 5. Use application whitelisting to limit execution of unauthorized scripts or binaries spawned by Dreamweaver. 6. Enforce the principle of least privilege for user accounts running Dreamweaver to minimize potential damage from exploitation. 7. Regularly audit and monitor logs for unusual activities related to Dreamweaver processes or OS command executions. 8. Consider network segmentation to isolate development environments from critical production systems to contain potential breaches.