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Week in review: Records allegedly stolen from Azure tenants, Medusa ransomware hits 500+ orgs
Week in review: Medusa ransomware hit 500+ orgs per CISA, millions of Azure tenant records allegedly stolen, SafePal and French tax authority breaches disclosed.
Help Net Security's weekly roundup covers the FBI, CISA, and HHS joint advisory update reporting Medusa ransomware has breached more than 500 organizations since June 2021, and threat actor TheHatman's claim of millions of employee records stolen from Azure tenants of Fortune 500 firms including McDonald's, Vodafone, Kyndryl, and Tata Consultancy Services, per Hudson Rock. It also covers the SafePal breach affecting 39,798 customers, France's DGFiP breach exposing data on 678,000 individuals, and UT San delaying its fall semester after a cyberattack. Security items include critical unauthenticated GitLab flaw CVE-2026-19478, an actively exploited patched macOS Screen Sharing flaw deploying a cryptominer, US charges against 17 Mabna Institute Iranian hackers over 31TB of stolen academic data, and Google Mandiant's AI agents finding 100+ high-severity vulnerabilities.
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First Agentic AI Data Breach Reported to Spanish Regulator
Spain's AEPD reported the first data breach executed by an AI agent, which autonomously chained login, vulnerability discovery, and personal data modification.
Spain's Data Protection Agency (AEPD) published details of the first breach notification in which an AI agent executed the attack, achieving a successful login, searching for vulnerabilities, and modifying personal data and accessing invoices. The agency called the agent's autonomous chaining of attack phases a qualitative change and urged updated risk analysis, faster incident response, and stronger credential protection. Investigation is ongoing; commentators cite possible causes including a guardrail jailbreak, an escaped test model, or an unauthorized LLM-based penetration test.
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Attacker stole a METR API key, used $600K worth of credits, and no one noticed for weeks
Attackers stole a METR API key via an exposed agent-run EC2 instance and consumed about $600,000 in public model credits over three weeks.
AI evaluation nonprofit METR disclosed two incidents. In March 2026, a fail-open bug in a vibe-coded app disabled authentication on a publicly accessible EC2 instance; an attacker prompted the running agent to reveal a model provider API key, added an SSH key for persistence, and consumed roughly $600,000 in free public-model credits over three weeks without being noticed. In May 2026, attackers probed METR's public infrastructure using agents, automated vulnerability discovery, credential stuffing, OAuth token attempts, and phishing; a separately exposed read-only SQL mechanism found by a bug bounty hunter risked leaking unpublished evaluation data, but no access to non-public data was confirmed.
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Spain reports first alleged AI-powered data theft attack
Spain's data protection agency received a report of an AI agent autonomously exploiting flaws, logging in, altering personal data, and reading invoices.
The Spanish Data Protection Agency (AEPD) was notified of an incident in which an AI agent powered by a known LLM reportedly searched for vulnerabilities, gained access to systems, modified personal data, and accessed financial documents. AEPD has not yet investigated or verified the report but says it shows AI-related data breaches are no longer theoretical. The agency urged defenders to revise incident-response procedures, strengthen credential and identity security, and explicitly account for machine-speed AI-assisted attacks.
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