Explore the most significant cybersecurity incidents involving exposed APIs, including attacks on legacy APIs, broken authentication, and the dangerous Shadow APIs. This in-depth analysis covers emerging API security vulnerabilities and trends from 2025, with projections for 2026. Discover how generative AI and agentic AI are accelerating risks, from phishing to API abuses and legal disasters. Learn from real-world case studies to strengthen your defenses against unauthorized access and data breaches.
This cybersecurity incident occurred due to the exploitation of business logic flaws and an API, allowing a threat actor to access 49 million customer records. The breach highlights the critical importance of securing APIs and partner portals to protect sensitive user information.
This 2023 incident exposed data from 37 million T-Mobile customers, highlighting the vulnerability of unauthenticated APIs. The exploitation of an API for six weeks allowed access to sensitive information, underscoring the critical importance of application programming interface security.
This cybersecurity incident stemmed from a vulnerability in Optus's API access control system, which was exploited in 2022. The breach impacted millions of customers, underscoring the critical importance of securing APIs to protect sensitive information.
This incident occurred due to a vulnerability in Twitter's API, which allowed attackers to compile information from 5.4 million accounts. The exposure of sensitive data such as email addresses and phone numbers highlights the inherent risks associated with misconfigured or flawed application programming interfaces.
This 2021 incident involved the exposure of data from up to 700 million LinkedIn users, obtained through API scraping. It demonstrated how APIs, if not managed with rigorous security, can be exploited for massive information extraction, even if the company classifies it as 'scraping' rather than a 'breach'.
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This incident is included due to the exploitation of an API vulnerability that enabled the massive harvesting of user data. The breach demonstrated how platform features, if not properly secured, can be misused to access sensitive information on a large scale.
Our ranking of cybersecurity incidents from exposed APIs is based on an editorial analysis of documented cases, highlighting the relevance and impact of security breaches in the API domain. It is not a scientific study, but an informative compilation for the public.