In May 2023, the company disclosed that a third party accessed their systems without authorization. They took immediate measures to mitigate the incident, including collaborating with the Federal Bureau of Investigation and employing a reputable fore...
A major department store chain in Spain, El Corte Inglés, experienced a data breach that compromised customer data. The breach occurred due to a security vulnerability in an external provider's system, leading to unauthorized access to customer inform...
The Polish Space Agency (POLSA) experienced a cybersecurity breach, leading to unauthorized access to their IT infrastructure. In response, POLSA severed its network connection from the internet to protect sensitive data. Although specific details a...
Berkeley Research Group (BRG), a firm specializing in tax, arbitration, and bankruptcy consulting, suffered a cyberattack in early March 2025. The attack involved ransomware, with hackers claiming to have stolen data and encrypted files from BRG's sys...
In March 2025, Barclays, a major U.K. bank, experienced a significant outage of its online banking services, leaving customers unable to transfer funds or make payments for several hours. This incident marked the second major outage for Barclays withi...
In late 2024, Cleo, a technology vendor contracted by Chicago Public Schools (CPS), experienced a cyberattack on a server containing student data. CPS was informed of unauthorized data access on February 8, 2025. The breach exposed the personal infor...
Orange Group, a French telecommunications company, has confirmed a cyberattack on its Romanian branch. A hacker, Rey, affiliated with the HellCat ransomware group, claims to have exploited compromised credentials and vulnerabilities in Orange's Jira s...
In February 2025, Angel One, a prominent Indian stock brokerage firm, experienced a significant data breach. The breach originated from compromised Amazon Web Services (AWS) resources, potentially exposing sensitive client data. Angel One was alerted...
In January 2024, the Toronto Zoo experienced a ransomware cybersecurity attack that resulted in the exposure of visitor and member transaction data spanning over two decades, from 2000 to April 2023. The compromised data, which was leaked on the dark...
On March 3, 2025, the Penn-Harris-Madison School Corporation (PHM) experienced a ransomware cyberattack. The attack affected the district's network, causing interruptions to Wi-Fi and internet access. As a precaution, all network-connected desktop com...
Cyber Security Case Studies has worked with a number of groups to develop these risk effect categories which represent a plain-english description of the impacts seen in public cyber events alongside their definition: