Anthropic confirmed it is investigating a report that a group gained unauthorized entry to its Claude Mythos model through a third‑party vendor portal. The breach, discovered via internet‑sleuthing tools and a developer portal, appears limited to exploratory testing rather than malicious exploitation. Anthropic’s Claude Mythos, released under the Project Glasswing preview, had been limited to a handful of trusted firms such as Amazon, Microsoft, Apple, Cisco and Mozilla, which used the model to identify hundreds of software flaws. The incident has revived concerns about AI‑driven cyber threats and the company’s recent designation as a supply‑chain risk by the U.S. Department of Defense. Read more →

A small group of users gained entry to Anthropic’s restricted Claude Mythos Preview AI model on the day the company announced its launch, exploiting a third‑party vendor environment by guessing the model’s URL. Anthropic confirmed it is investigating the incident and said there is no evidence the breach affected its core systems. The episode highlights vulnerabilities in the way frontier AI tools are shielded behind external partners, raising concerns about the security of powerful cybersecurity AI models that can autonomously discover and exploit zero‑day vulnerabilities. Read more →

A private online forum has reportedly breached Anthropic’s newly unveiled cybersecurity AI, Mythos, according to Bloomberg. The group, linked to a Discord channel that hunts unreleased AI models, accessed the tool through a third‑party contractor that works with Anthropic. Anthropic confirmed it is investigating the incident but said no evidence yet shows the breach affected its own systems. Mythos, rolled out to a handful of vendors such as Apple under the Project Glasswing initiative, was designed to strengthen enterprise security, raising concerns that the tool could be repurposed by malicious actors. Read more →