CVE-2025-4613 is a vulnerability classified under CWE-20 (Improper Input Validation) affecting Google Web Designer App on Windows platforms prior to version 16.3.0.0407. The flaw arises from insufficient validation of input paths when handling ad templates, enabling a path traversal attack. This allows an attacker to craft a malicious ad template file that, when downloaded and opened by a user, can execute arbitrary code remotely on the victim's system. The attack vector is network-based (AV:N) but requires high attack complexity (AC:H), partial privileges (PR:L), and user interaction (UI:A). The vulnerability impacts confidentiality, integrity, and availability, with a CVSS 4.0 base score of 7.1, indicating high severity. The scope is limited to Windows users of the affected Google Web Designer versions. Although no public exploits are reported, the potential for remote code execution makes this a critical risk for organizations relying on this software for digital content creation. The vulnerability underscores the importance of robust input validation and secure handling of third-party templates in creative software.

The vulnerability allows attackers to execute arbitrary code remotely by delivering malicious ad templates, potentially leading to full system compromise. This can result in data theft, unauthorized system control, disruption of design workflows, and deployment of further malware within organizational networks. Given Google Web Designer's role in creating web and ad content, compromised systems could also be used to distribute malicious content to end users, amplifying the attack impact. Organizations may face operational downtime, reputational damage, and financial losses due to exploitation. The requirement for user interaction and partial privileges somewhat limits automated widespread exploitation but does not eliminate targeted attacks, especially in environments where users frequently handle external templates. The vulnerability is particularly impactful in sectors heavily reliant on digital advertising and web content creation, including marketing agencies, media companies, and enterprises with in-house creative teams.

Immediate mitigation involves updating Google Web Designer to version 16.3.0.0407 or later, where the vulnerability is patched. Until patching is possible, organizations should enforce strict controls on the sources of ad templates, restricting downloads to trusted repositories and verifying template integrity before use. Implement endpoint security solutions capable of detecting suspicious file behaviors and monitor for unusual process executions related to Google Web Designer. User education is critical to prevent opening untrusted templates and recognizing phishing attempts that may deliver malicious files. Network segmentation can limit the spread of compromise if exploitation occurs. Additionally, applying application whitelisting and least privilege principles on user accounts running Google Web Designer can reduce exploitation success. Regular vulnerability scanning and threat intelligence monitoring for emerging exploits related to this CVE are recommended.