The first ai-generated zero-day hit production
the first ai-generated zero-day hit production: google’s threat intel group confirmed a criminal used an llm-written exploit to bypass two-factor auth on an open-source admin tool this may, and anthropic’s unreleased claude found thousands of high-severity vulnerabilities across every major os and browser.
the attackers got the weapon before the defenders got the policy.
Context
Verified event date: Google's Threat Intelligence Group reported on May 11, 2026 that it identified a threat actor using a zero-day exploit it believes was developed with AI, a two-factor authentication bypass in a popular open-source web-based admin tool, planned for mass exploitation (Google Cloud blog; CNBC; The Hacker News, May 11).
Anthropic's Claude Mythos Preview assessment (Apr 7, 2026) says the model can identify and exploit zero-day vulnerabilities in every major operating system and web browser when directed by a user.
The criminal AI-built 2FA bypass matches GTIG's May 11 report, and Anthropic's wording matches 'every major OS and browser'. The post presents the Mythos finding as 'unreleased'; Anthropic's page describes a Preview model, so how widely it is available was not seen in the sources read, so unsupported here, not refuted. 'Thousands' matches Tom's Hardware's headline of thousands of zero-days. 'The attackers got the weapon before the defenders got the policy' is the author's.
Related work
Watch next
- Check whether the exploited admin tool was patched and named.
Sources
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 1 October 2026 at 23:39 IST. Sources are the papers and datasets the note draws on.
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