Nintendo Under Data Breach of 859MB of Sensitive Data
Nintendo Under Data Breach of 859MB of Sensitive Data
The threat actor group SHADOWBYT3$ claims to have breached Nintendo, allegedly exfiltrating 859 MB of sensitive data, causing a data breach. First detected on June 13, 2026, the unverified leak reportedly originates from TINYpulse, a third-party employee management platform. Stolen information allegedly includes corporate emails, employee names, and internal surveys, alongside highly sensitive financial documents like bank statements and W-9 forms, raising significant identity theft risks. According to Nintendo, the breach actually took place, however affected data is limited to internal survey content comprising a small subset of the employees and most of the information dates back several years.
Source: Cyber Security News, Kotaku
iRhythm Discloses Cyberattack: No Impact on Core Systems
Digital health company iRhythm disclosed a cyberattack in an SEC filing after detecting unauthorized activity on June 8. A threat actor contacted the company the following day, claiming to have stolen proprietary data and patient health information while demanding a ransom. While iRhythm confirmed data was stolen, it stated the breach did not impact its core clinical systems, medical devices, or financial and payment systems.
Source: Security Week
AI Agent Guardrails can be a DoS Weapon
A new cybersecurity study from the Hong Kong University of Science and Technology reveals that AI agent guardrails can be exploited as DoS weapons. By using a single poisoned document, attackers can trap reasoning-based safety systems in extended thinking loops rather than bypassing them. This “reasoning-extension DoS” can slow shared AI workflows. The attack targets system availability and resource exhaustion, turning centralized AI governance infrastructure into a critical enterprise vulnerability.
Source: CSO Online
Anthropic Fable 5 and Mythos 5 Access Blocked
On June 12, the U.S. government issued an export control directive ordering Anthropic to block foreign nationals from accessing its two most capable AI models, Fable 5 and Mythos 5, over national security concerns regarding a potential software-flaw jailbreak. Because selective filtering is operationally impractical, Anthropic instituted a worldwide shutdown of both models for all users. All other Anthropic models remain fully operational.
Source: Cyber Security News
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