CVE-2026-21328 is an out-of-bounds write vulnerability classified under CWE-787 found in Adobe After Effects versions 25.6 and earlier. This vulnerability arises when the software improperly handles memory boundaries while processing input data from project files or other file types used by After Effects. An attacker can craft a malicious file that, when opened by a user, triggers the out-of-bounds write, potentially overwriting memory regions leading to arbitrary code execution. The exploit runs with the privileges of the current user, which could allow attackers to execute malicious payloads, install malware, or manipulate system files. The attack vector requires local user interaction, meaning the victim must open the malicious file, but no prior authentication or elevated privileges are necessary. The vulnerability affects confidentiality, integrity, and availability, as arbitrary code execution can lead to data theft, system compromise, or denial of service. The CVSS 3.1 base score of 7.8 reflects the high impact and relatively low complexity of exploitation. No patches or official fixes have been released yet, and no active exploitation has been reported. Adobe After Effects is widely used in media production, making this vulnerability particularly relevant to creative industries and organizations handling multimedia content.

For European organizations, especially those in media, advertising, film production, and digital content creation, this vulnerability poses a significant risk. Exploitation could lead to unauthorized access to sensitive project files, intellectual property theft, and potential disruption of production workflows. Since After Effects is often used on workstations with access to corporate networks and storage, a successful exploit could serve as a foothold for lateral movement within an organization. The arbitrary code execution capability could also enable attackers to deploy ransomware or other malware, impacting business continuity. The requirement for user interaction limits mass exploitation but targeted attacks against high-value individuals or organizations remain a concern. The lack of a patch increases exposure time, and organizations relying heavily on Adobe After Effects should prioritize mitigation. Confidentiality, integrity, and availability of critical creative assets and systems are at risk, which could have financial and reputational consequences.

Until Adobe releases an official patch, organizations should implement strict controls on file sources by restricting the opening of After Effects project files from untrusted or unknown origins. Employ application whitelisting and sandboxing techniques to isolate After Effects processes and limit the impact of potential exploitation. Educate users about the risks of opening unsolicited or suspicious files and encourage verification of file origins. Monitor endpoint detection and response (EDR) systems for unusual behavior related to After Effects processes. Consider disabling or limiting After Effects usage on systems that do not require it. Network segmentation can reduce the risk of lateral movement if a workstation is compromised. Maintain up-to-date backups of critical project files and systems to enable recovery in case of an incident. Once Adobe releases a patch, prioritize immediate deployment and verify successful remediation through vulnerability scanning and testing.