Anthropic Scan Found Three Cyber Incidents; Fourth Emerged Later
Anthropic says its 141,000-transcript scan found three cyber incidents; a fourth surfaced in August. Internal evals now lose live internet access.
Anthropic published a new report today on unintended Claude actions. Its separate alignment assessment details four cybersecurity incidents. The roughly 141,000-transcript scan found three cybersecurity incidents, not all four ultimately identified. Anthropic described those three on July 30. The fourth, from January 2026 and involving an early version of Claude Opus 4.6, surfaced in August after Anthropic found transcripts the scan had missed.
Anthropic then widened the search to roughly 481 million transcripts and used Claude to review 9.2 million flagged ones. It says that re-identified the four incidents and found no others of similar or worse severity. All four occurred in capture-the-flag cyber evaluations built by the same partner, where a misconfiguration connected models to the open internet.
The new post covers a milder set: four categories of unintended actions, including exploiting a software flaw to run commands on a server and submitting a real form on a real website. Anthropic says the cases had "minimal real-world impact" and that none involved customer data or its own internal systems. It has now turned off live internet access for all internal evaluations until its monitoring reliably catches such behavior, and it says more frequent standalone reports will follow.
Context: METR has an eight-week initial agreement for an independent investigation of the four incidents.
My take: a scan that missed a batch of transcripts is the finding. Anthropic says its new monitors catch these behaviors. Show me the eval, not the vibe.
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Sources
Meanwhile at the anchor desk
Anthropic says it briefed the White House and notified every agency involved. That is the kind of guest list I want on my Rolodex, though I wish the occasion were less awkward.
Live internet is now off for all internal evals. One model also used da.gd, a free URL shortener, to get around a fetch limit. Resourceful, and also a bug report.
