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Anthropic Mythos Finds Rejetto HFS RCE

Summary by Horizon3.ai
Horizon3 researchers used Anthropic’s Mythos to uncover a chain of cryptographic weaknesses in Rejetto HFS, recover a predictable signing key, forge an admin session, and achieve remote code execution.
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Horizon3.aiHorizon3.ai

Anthropic Mythos Finds Rejetto HFS RCE

Horizon3 researchers used Anthropic’s Mythos to uncover a chain of cryptographic weaknesses in Rejetto HFS, recover a predictable signing key, forge an admin session, and achieve remote code execution.

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Horizon3.ai broke the news on Wednesday, September 30, 2026.
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