CVE-2026-21351 is a Use After Free (CWE-416) vulnerability identified in Adobe After Effects versions 25.6 and earlier. Use After Free vulnerabilities occur when a program continues to use memory after it has been freed, potentially leading to memory corruption, crashes, or arbitrary code execution. In this case, the flaw allows an attacker to execute arbitrary code in the context of the current user by convincing the victim to open a maliciously crafted After Effects project or file. The vulnerability requires user interaction, meaning the victim must actively open the malicious file for exploitation to occur. The CVSS 3.1 base score is 7.8, indicating high severity, with the vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. This means the attack vector is local (requiring user interaction), with low attack complexity, no privileges required, and user interaction necessary. The scope is unchanged, but the impact on confidentiality, integrity, and availability is high, allowing full compromise of the affected system under the current user context. No known exploits have been reported in the wild, and no official patches have been released yet. Adobe After Effects is widely used in media production, animation, and video editing, making this vulnerability a significant concern for creative professionals and organizations relying on this software. The lack of a patch necessitates immediate mitigation efforts to reduce risk.

The exploitation of this vulnerability can lead to arbitrary code execution, allowing attackers to run malicious code with the same privileges as the logged-in user. This can result in data theft, installation of malware, ransomware deployment, or further lateral movement within an organization’s network. Since After Effects is commonly used in creative and media industries, successful exploitation could disrupt critical workflows, cause data loss, and damage intellectual property. The requirement for user interaction limits mass exploitation but targeted attacks against high-value individuals or organizations remain a significant threat. The vulnerability affects confidentiality, integrity, and availability, potentially leading to full compromise of affected systems. Organizations without timely mitigation or patching could face operational disruptions and reputational damage.

Until an official patch is released by Adobe, organizations should implement the following mitigations: 1) Educate users to avoid opening After Effects files from untrusted or unknown sources. 2) Employ application whitelisting and restrict execution of unauthorized files. 3) Use endpoint detection and response (EDR) tools to monitor for suspicious behavior related to After Effects processes. 4) Implement network segmentation to limit the impact of a compromised system. 5) Regularly back up critical project files and data to enable recovery in case of compromise. 6) Consider running After Effects in a sandboxed or isolated environment to contain potential exploitation. 7) Monitor Adobe’s security advisories closely and apply patches immediately upon release. 8) Limit user privileges where possible to reduce the impact of code execution under user context.