Summary Points
- Attackers exploited API vulnerabilities and known software flaws, especially in Metabase, to leak large volumes of personal data across Japanese organizations.
- The methods included analyzing app API endpoints, stealing API keys, and exploiting flaws like SQL injection in Metabase’s CVE-2026-72898.
- Despite fixes, attacks continued into late 2026, with indicators such as suspicious IP activity, abnormal API requests, and unauthorized admin access.
- No attribution has been made, but high-volume, targeted attacks suggest widespread exploitation of basic vulnerabilities and poor system security practices.
Japan Experiences Surge in Web Data Leaks Due to API Exploits and Software Flaws
Japan is facing a significant rise in data leaks caused by malicious attacks on web systems. According to the JPCERT Coordination Center, hackers are exploiting weaknesses in mobile app APIs and known software vulnerabilities. These breaches impact not only consumer applications but also internal business tools and management systems, leading to personal data leaks in some cases. The attacks are often targeted and happen in quick succession, especially since September 2026. Macnica, a cybersecurity research firm, reports over 119 incidents this year involving stolen or leaked personal data, a sharp increase compared to previous years. Recent victims include online shops, member services, libraries, and even a train booking system. This trend suggests that attackers are broadening their scope and intensifying their efforts to access sensitive information across various platforms.
Transitioning from individual cases to the bigger picture, these breaches highlight how hackers are using different techniques to invade systems. They analyze publicly available apps, steal API keys, and exploit flaws like excessive privileges or insecure session management. Some attacks involve scanning each target for common vulnerabilities, rather than relying on a single known flaw. Notably, a common method includes attacking weak admin passwords and exploiting known software bugs. This widespread activity indicates a high level of adaptability among cybercriminals, making it critical for organizations to tighten their security measures and keep software updated. The increase in breaches underscores the importance of enhanced security practices in safeguarding personal information in Japan’s increasingly digital landscape.
Exploiting Software Flaws and Strengthening Defenses
One of the notable vulnerabilities exploited by attackers is a flaw in Metabase, an open-source business intelligence tool. Known as CVE-2026-72898, this SQL injection flaw enables hackers to access database information without needing an account. It was exploited as a zero-day attack against Metabase’s cloud service and is considered extremely dangerous, scoring a perfect 10.0 on the CVSS scale. After the flaw was discovered, Metabase issued security updates urging users to upgrade to safer versions. Despite these efforts, attacks continued into early September, indicating that not everyone applied the patch promptly. For organizations unable to upgrade immediately, a temporary workaround involves blocking specific API endpoints. Operators are advised to examine server logs for signs of attacks, such as unusual requests or error responses, and to take comprehensive steps like revoking sessions, reviewing API keys, and auditing database access. These measures are crucial for minimizing damage and preventing future breaches, especially as attackers continue exploiting known vulnerabilities in widely used tools.
While the exact identity of the hackers remains unknown, evidence points to systematic probing of web systems. Attackers often scan for APIs with weaknesses, such as excessive data exposure or insufficient access controls. They also exploit poor password security and known software bugs, making it essential for organizations to implement strict security policies. Regular updates, vigilant monitoring, and adopting best practices recommended by cybersecurity authorities are vital steps to defend against these evolving threats. As digital operations become more ingrained in daily life and business, ensuring the integrity of web systems will remain a top priority to protect individuals’ privacy and organizational data alike.
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