The EU’s AWS “Master Key”: How a Compromised Trivy Update Leaked 340GB of Data

The digital defenses of the European Union faced a significant test this March as a sophisticated supply-chain attack compromised the public website platform of the European Commission. The incident, which centered on the “europa.eu” infrastructure hosted on Amazon Web Services (AWS), has exposed a massive trove of data and highlighted the growing danger of trusting third-party software updates.

The breach didn’t start with a direct assault on the Commission’s servers. Instead, investigators found that “initial access was obtained through the Trivy supply-chain compromise, which was publicly attributed to a threat actor known as TeamPCP”.

On March 19, 2026, the attackers leveraged a compromised version of the popular security tool Trivy—received through “normal software update channels”—to steal an AWS API key. This single secret acted as a master key, granting “control over other AWS accounts affiliated with the European Commission”. Once inside, the threat actor used scanning tools like TruffleHog to hunt for more credentials while attempting to hide their tracks.

While the Commission’s internal systems remained untouched, the impact on public-facing data was severe. On March 28, the notorious extortion group ShinyHunters published the stolen dataset on their dark web leak site.

The scale of the exfiltration is staggering:

• Total Volume: Approximately 91.7 GB compressed, or 340 GB of raw data.
• Sensitive Content: The leak includes “data dumps of mail servers, databases, confidential documents, contracts, and much more sensitive material”.
• Personal Data: Confirmed records include names, usernames, and email addresses.
• Communication Exposure: Over 51,000 files related to outbound emails were taken. While many were automated, some “may contain the original user-submitted content, posing a risk of personal data exposure”.

The reach of the breach extends beyond the Commission itself; “data pertaining to at least 29 other Union entities may be affected”.

The European Commission responded swiftly by revoking access keys and notifying data protection authorities. However, the incident serves as a stark reminder that “trusted vendors can become vectors for malicious code distribution”.

For CISOs and system administrators, CERT-EU offers critical advice to prevent becoming the next link in the chain:

1. Secure the CI/CD Pipeline: Pin GitHub Actions to full SHA hashes rather than mutable tags and restrict pipeline access to cloud credentials.
2. Audit and Rotate: Organizations using Trivy must update to a safe version and immediately “rotate all AWS secrets and credentials that may have been exposed”.
3. Monitor Behavior: Deploy real-time alerting to catch “anomalous CI/CD activity, such as unexpected secret access” before data can be moved.

As the analysis of the databases continues, the European community remains on high alert for secondary phishing attacks targeting the individuals whose names and emails are now in the hands of extortionists.