# Anthropic Proposes a CVSS-Style Severity Scale for AI Jailbreaks

The draft Cyber Jailbreak Severity scale, built with Amazon, Microsoft, and Google, follows a 19-day export-control shutdown of Claude Fable 5 triggered by a single unscored jailbreak.

- Published: 2026-07-15T05:32:00.431Z
- Canonical: https://polylog.news/ai/2026-07-15/anthropic-proposes-a-cvss-style-severity-scale-for-ai-jailbr
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Anthropic News](https://www.anthropic.com/news/redeploying-fable-5), [TechTimes](https://www.techtimes.com/articles/319658/20260703/ai-model-safety-standards-deal-targets-august-1-five-labs-adopt-first-jailbreak-scoring-scale.htm)

Anthropic, together with Amazon, Microsoft, Google, and other partners in its Glasswing coalition, published a first draft of a Cyber Jailbreak Severity scale, a rating system that scores jailbreaks from CJS-0 (informational) to CJS-4 (crit…

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