CVE-2021-28623 is a vulnerability identified in Adobe Premiere Elements version 5.2 and earlier, involving the insecure creation of temporary files within directories that have incorrect permissions (classified under CWE-379). This vulnerability arises because the application creates temporary files in a manner that does not properly restrict access permissions, potentially allowing unauthorized users to manipulate these files. An unauthenticated attacker can exploit this flaw by invoking functions related to the Adobe Premiere installer, enabling them to perform actions with elevated privileges on the affected system. Notably, exploitation does not require any user interaction, increasing the risk of automated or remote attacks. The vulnerability primarily impacts the confidentiality, integrity, and availability of the system by allowing privilege escalation through improper file handling. Although no known exploits have been reported in the wild, the insecure temporary file creation represents a significant security weakness, especially in environments where Adobe Premiere Elements is widely used. The lack of a patch or official remediation at the time of reporting further emphasizes the need for immediate attention to mitigate potential risks associated with this vulnerability.

For European organizations, the exploitation of CVE-2021-28623 could lead to unauthorized privilege escalation on systems running vulnerable versions of Adobe Premiere Elements. This could allow attackers to execute high-privilege actions, potentially leading to system compromise, data theft, or disruption of business operations. Media production companies, creative agencies, and any enterprises relying on Adobe Premiere for video editing and content creation are particularly at risk. The vulnerability's ability to be exploited without user interaction increases the threat level, as attackers could automate attacks or integrate them into broader campaigns targeting creative industry infrastructure. Additionally, compromised systems could serve as footholds for lateral movement within corporate networks, increasing the risk of widespread impact. Given the critical role of digital media in marketing, communications, and entertainment sectors across Europe, successful exploitation could result in reputational damage, financial losses, and regulatory scrutiny under data protection laws such as GDPR.

1. Immediate mitigation should include restricting permissions on directories used for temporary file creation by Adobe Premiere Elements to prevent unauthorized access or modification. 2. Organizations should audit and monitor file system permissions related to Adobe Premiere installation and runtime directories to detect anomalies. 3. Employ application whitelisting and endpoint protection solutions to detect and block unauthorized execution of installer functions or suspicious activities related to temporary file manipulation. 4. Where possible, upgrade to the latest version of Adobe Premiere Elements that addresses this vulnerability or apply any available vendor patches or workarounds. 5. Implement network segmentation to isolate systems running vulnerable software, limiting the potential for lateral movement if exploitation occurs. 6. Conduct user awareness training focused on recognizing unusual system behaviors, even though this vulnerability does not require user interaction, to enhance overall security posture. 7. Regularly review and update security policies to include checks for insecure file permission settings and temporary file handling practices.