The European Commission cloud breach didn’t start with a dramatic system attack or an obvious outage. It started quietly, with a trusted tool, an update routine, and a single compromised credential. Within days, that was enough to expose nearly 91.7 GB of data and implicate multiple EU entities in a widening cybersecurity incident.
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The European Commission's cloud breach, publicly disclosed on March 27, is now seen as a clear example of how supply chain attacks are reshaping risk in cloud environments. Not because defenses were absent, but because the entry point seemed legitimate.
Researchers from CERT-EU state with high certainty that the European Commission's cloud breach began with a breach in the supply chain involving Trivy, a widely used security scanning tool. The malicious version, attributed to a threat actor known as TeamPCP, was inadvertently deployed in the Commission's environment after being delivered through normal information channels.
On March 19, the attacker obtained an AWS secret, an API key — with administrative privileges. This unique key became the gateway to the Commission’s cloud. From there, the activity was intentional. The attacker attempted to reveal more credentials using TruffleHog, a tool designed to scan for secrets and validate access through the AWS Security Credential Service (STS). They also created a new access key associated with an existing user, an attempt to maintain access while avoiding detection.
The impact became clearer a few days later. A large amount of data — about 91.7 GB compressed, or about 340 GB uncompressed — was extracted from the compromised AWS account.
On March 28, the data extortion group ShinyHunters published the dataset on its dark web leak site. The group claimed that it included “data dumps from mail servers, databases, confidential documents, contracts, and much more sensitive material.”
Initial analysis confirms that the European Commission's cloud breach exposed personal data, including names, usernames and email addresses. The dataset also contains more than 51,000 files linked to outgoing email communications.
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While most of these emails are automated notifications, some “bounce-back” messages may include original user-submitted content. This detail is important, as it increases the risk of inadvertent exposure of personal data in systems that rely on user interaction.
The timeline of the European Commission's cloud breach highlights how quickly such incidents can unfold:
- March 19: AWS credential obtained via compromised Trivy tool
- March 24: Alerts triggered due to unusual API activity and traffic spikes
- March 25: CERT-EU was notified, access was secured and keys were revoked
- March 27: Public disclosure by the European Commission
- March 28: Data published by ShinyHunters
In less than ten days, the attack moved from initial access to public data exposure.
The European Commission acted quickly once the breach was discovered. The compromised AWS secret was secured, the newly generated access keys were deactivated, and all known exposed credentials were disabled or deleted.
The authorities also followed regulatory protocol by informing data protection authorities, including the European Data Protection Supervisor (EDPS), and notifying affected entities. Direct communication with affected customers began on March 31.
Importantly, the Commission has stated that its internal systems were not affected. However, the European Commission cloud breach remains under active investigation, particularly as analysis of the exposed databases continues.
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The European Commission’s cloud breach is not just about one incident or one tool. It reflects a deeper issue: the increasing difficulty of verifying trust in modern software ecosystems. Cloud environments, automated workflows, and open source tools have made operations faster and more efficient. But they have also introduced new blind spots.
See also: European Commission investigates breach related to cloud infrastructure
The lesson here is uncomfortable but clear — the security controls worked, but they worked slowly. The detection came after access had already been established and the data had already been moved. And therein lies the real danger.
