CVE-2026-28267 identifies a vulnerability in Digital Arts Inc.'s i-フィルター 10 software for Windows versions prior to 10.02.00, caused by incorrect default file access permissions. Specifically, the product allows non-administrative users to create or overwrite files within system or backup directories, which are typically protected areas of the operating system. This misconfiguration violates the principle of least privilege, enabling users with limited rights to modify files that could affect the software's operation or system stability. The vulnerability does not require user interaction and has a low attack complexity, but it does require local privileges (limited user account). The impact is primarily on integrity, as unauthorized file modifications can lead to altered program behavior or potential privilege escalation if exploited in conjunction with other vulnerabilities. The CVSS 3.0 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) reflects these characteristics, indicating local attack vector, low complexity, limited privileges, no user interaction, unchanged scope, no confidentiality or availability impact, but high integrity impact. No public exploits are currently known, and no patches or mitigation links were provided in the source data, suggesting that users should seek updates from the vendor or implement workarounds to restrict file permissions manually.

The vulnerability's primary impact is on the integrity of affected systems, as unauthorized users can modify or replace files in critical directories. This can lead to altered application behavior, potential introduction of malicious code, or disruption of backup processes. While confidentiality and availability are not directly impacted, the integrity compromise could serve as a stepping stone for further attacks, such as privilege escalation or persistence mechanisms. Organizations relying on i-フィルター 10 in Windows environments may face risks of internal misuse or exploitation by malicious insiders or attackers who have gained limited user access. The absence of known exploits reduces immediate risk, but the ease of exploitation and potential consequences warrant proactive measures. The threat is particularly relevant for enterprises and institutions in Japan and other countries where this software is deployed for content filtering or parental control, as compromise could undermine security policies and system reliability.

To mitigate CVE-2026-28267, organizations should first verify the version of i-フィルター 10 in use and upgrade to version 10.02.00 or later once available. In the absence of an official patch, administrators should manually audit and correct file and directory permissions for the system and backup directories used by the software, ensuring that only administrative accounts have write access. Implementing strict access control lists (ACLs) and leveraging Windows security policies to restrict non-administrative user permissions can reduce risk. Additionally, monitoring file integrity in these directories with endpoint detection and response (EDR) tools can help detect unauthorized changes. Limiting local user privileges and enforcing the principle of least privilege across the environment will further reduce the attack surface. Finally, educating users about the risks of local privilege misuse and maintaining robust internal security controls will help prevent exploitation.