Japan Reports Increase in Data Breaches Due to API Abuse

Japan has recorded a significant increase in data breaches across various organizations attributed to the abuse of APIs for mobile applications. According to a report from the JPCERT Coordination Center (JPCERT/CC) dated October 8, 2026, these incidents are the result of targeted attacks exploiting known software vulnerabilities. The warning from JPCERT/CC is based on a variety of incidents reported in recent months. The exact number of affected organizations has not been disclosed; however, it is known that the attacks occurred across different sectors.

JPCERT/CC did not specify any attackers or affected companies in its statement, complicating the analysis of the incidents. However, the agency emphasized that the attacks are characterized by a combination of API abuse and the exploitation of security gaps in software products. A central point of the warning is the increasing use of APIs in mobile applications, which are often inadequately secured. These APIs provide attackers access to sensitive data if not properly protected. JPCERT/CC has urged organizations to review their security measures and ensure that all APIs are adequately secured.

The attacks often target known vulnerabilities in software that have not been patched in a timely manner. JPCERT/CC has pointed out that many of these vulnerabilities can be found in widely used software solutions. The agency recommends conducting regular security audits and promptly implementing all software updates to minimize the risk of data breaches. In addition to technical recommendations, JPCERT/CC has stressed that training for employees regarding cybersecurity is essential. An informed employee can help identify and report potential security incidents early.

Raising awareness of the dangers of API abuse and other cyber threats is a crucial step towards improving the security landscape in organizations. The agency has also noted that the attacks are not limited to large companies. Smaller organizations are also at risk, as they often have fewer resources to allocate to cybersecurity. JPCERT/CC calls on all organizations, regardless of size, to take proactive measures to protect their data. The current situation in Japan reflects a global trend where cyberattacks are increasing and becoming more sophisticated.

The threat of API abuse and software vulnerabilities is not confined to Japan but affects companies worldwide. JPCERT/CC has emphasized that international cooperation and information sharing between countries are crucial to effectively address these threats. The agency plans to release further information and recommendations in the coming weeks to help organizations optimize their security strategies and better prepare for future threats. JPCERT/CC has already announced that it will regularly report on new developments and security incidents.

The warning from JPCERT/CC comes at a time when digital transformation is advancing in Japan and globally. The increasing reliance on digital technologies and mobile applications heightens the risk of cyberattacks. Organizations are required to continuously adapt and improve their security strategies to meet new challenges. The vulnerabilities exploited in recent months are often found in widely used software solutions. JPCERT/CC has not specified any CVE numbers; however, it is known that many of these vulnerabilities have existed for a long time and have not been adequately addressed.

The agency urges all companies to regularly check their systems for known vulnerabilities. The current warning from JPCERT/CC is another indication of the urgent need to strengthen cybersecurity measures. The agency has emphasized that the responsibility for data security does not rest solely with IT departments but must also be borne by corporate management. A comprehensive approach to cybersecurity is essential to ensure the integrity and confidentiality of data.

JPCERT/CC will continue to work closely with affected organizations to identify the causes of data breaches and take appropriate measures. The agency has announced that it will increase training and workshops in the coming months to raise awareness of cybersecurity and improve employee skills. The warning issued on October 8, 2026, is part of a broader strategy by JPCERT/CC to strengthen cybersecurity in Japan and enhance resilience against future threats.