Top Highlights
- Odido, a major Dutch telecom, suffered a significant data breach, with over 1 million customer records published online following a failed extortion attempt by the ShinyHunters group in February 2026.
- The leaked data includes sensitive personal and financial information such as full names, addresses, phone numbers, email addresses, bank account details, and government-issued IDs, heightening risks of fraud and identity theft.
- Approximately 688,100 current and former customers are affected, with some records containing passport numbers, driver’s license numbers, and dates of birth, and the breach has been added to the Have I Been Pwned database.
- Odido advises affected customers to monitor accounts, watch for phishing attempts, update passwords, enable multi-factor authentication, and check exposure risks via the HIBP platform to mitigate potential damages.
Underlying Problem
In February 2026, a major data breach targeted Odido, a leading Dutch telecommunications company. Cybercriminal group ShinyHunters launched the attack after an unsuccessful extortion effort, releasing over one million customer records online. Initially, they published 317,000 email addresses, and the next day, they released an additional 371,000 email addresses, totaling approximately 688,100 affected accounts, affecting both current and former customers. The breach exposed highly sensitive information, including full names, addresses, phone numbers, bank details, birth dates, and government IDs, significantly heightening the risk of identity theft and financial fraud. Odido publicly acknowledged the incident, warning customers, especially those with older accounts, to take precautions such as monitoring bank activity and updating passwords. The breach’s details have been added to the Have I Been Pwned database, alerting users to potential exposure. This incident underscores the ongoing danger of extortion-driven cyberattacks targeting telecom providers that store extensive personal and financial data, emphasizing the need for heightened cybersecurity measures.
Critical Concerns
The recent incident where 1 million records from Dutch telecom Odido were published online after an extortion attempt highlights a serious threat that any business could face. If your business stores sensitive customer data, hackers might target you with ransomware or extortion schemes. Once your data is accessed or leaked, it can damage your reputation, cause financial losses, and lead to legal consequences. Moreover, the fallout can disrupt operations, erode customer trust, and invite further malicious attacks. As this example shows, without proper security measures, your business’s confidential information is vulnerable. Therefore, it is crucial to implement robust cybersecurity protocols and recovery plans. In today’s digital landscape, a single breach can have far-reaching, damaging effects on your organization’s stability and growth.
Possible Next Steps
In the modern digital landscape, swift remediation of data breaches is crucial to protect sensitive information, maintain customer trust, and prevent further exploitation. When 1 million records from Dutch telco Odido are published online following an extortion attempt, immediate action is essential to mitigate damage and reinforce security posture.
Assessment & Containment
- Identify the breach source and scope
- Isolate affected systems to prevent spread
- Preserve evidence for analysis
Communication & Notification
- Inform internal stakeholders and leadership
- Comply with legal and regulatory reporting requirements
- Notify affected customers if applicable
Remediation & Recovery
- Remove leaked data from public access
- Patch vulnerabilities exploited during the attack
- Reset compromised credentials and accounts
Monitoring & Prevention
- Implement continuous monitoring for unusual activity
- Strengthen network defenses (firewalls, IDS/IPS)
- Apply robust access controls and multi-factor authentication
Review & Improve
- Conduct a thorough post-incident analysis
- Update incident response and security policies
- Provide training to staff on security best practices
Continue Your Cyber Journey
Stay informed on the latest Threat Intelligence and Cyberattacks.
Explore engineering-led approaches to digital security at IEEE Cybersecurity.
Disclaimer: The information provided may not always be accurate or up to date. Please do your own research, as the cybersecurity landscape evolves rapidly. Intended for secondary references purposes only.
Cyberattacks-V1cyberattack-v1-multisource
