Alert: Crypto Analytics Giant Nansen Under Attack, 7% Users Data Compromised

Nansen, a trusted blockchain analytics platform, said that it has witnessed a cybersecurity breach that had compromised its user data.
By Coingape Staff
Updated May 20, 2025
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In a recent development, Nansen, the blockchain analytics platform widely trusted for its insights and data-driven solutions, faced a cybersecurity incident. The breach alert has sent shockwaves through its user base. Meanwhile, On September 20, the company received unsettling news from one of its third-party vendors that their systems had been compromised.

This breach granted unauthorized access to a crucial account responsible for provisioning customer access to the platform, raising concerns about the safety of user data.

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Nansen Security Breach

Nansen’s ordeal began when one of its trusted third-party vendors fell victim to a cyberattack, leading to unauthorized access to an admin account pivotal for customer access provisioning. While swift action was taken to halt the breach and launch an immediate investigation, the repercussions of this incident continue to reverberate.

The impacted vendor, known for serving many Fortune 500 companies and other industry players, now faces the obligation of publicly disclosing the breach. According to Nansen, it would help alert other potentially affected organizations.

However, in the aftermath of the breach, Nansen initiated a meticulous investigation over 48 hours to assess the scale of the incident’s impact. The results were concerning with about 6.8% of Nansen’s user base bearing the brunt of the breach.

For this group, email addresses were exposed, with a smaller faction also having their password hashes compromised. Lastly, a minority had their blockchain addresses exposed to malicious actors.

However, Nansen promptly communicated with the affected individuals via email, detailing the extent of the breach and its implications for each user to ensure transparency and user awareness.

Nansen Security Breach Notice
Source: Nansen Official Twitter Handle

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What’s Next?

To mitigate the potential risks stemming from this breach, Nansen swung into action. The company diligently dispatched official emails from its verified email ID between 5 pm and 9 pm UTC on September 21, urging affected users to reset their passwords.

This precautionary step is crucial in safeguarding user accounts against possible brute-force attacks driven by malicious actors.

Nansen asked its users, both affected and unaffected, to remain vigilant against phishing attempts. In addition, it added that verifying the sender’s authenticity for all communications claiming to originate from Nansen is essential to thwart potential phishing endeavors.

Nansen claims to remain deeply committed to its users’ security and privacy. The company has embarked on a comprehensive investigation, working closely with the impacted vendor, external legal experts, and cybersecurity specialists to uncover the root causes of the breach and ensure such incidents do not repeat in the future.

The company is determined to communicate transparently with its user base, acknowledging their concerns and striving to provide a safe and secure environment. Users with questions or doubts are encouraged to reach out to Nansen for clarification.

Meanwhile, Nansen assures its users that the safety of their data and assets remains a paramount priority.

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Coingape Staff
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