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Stolen Fireworks AI Key Led to Cursor Data Breach and Trojanized Claude Code Extension

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​The compromise of Anthropic’s official Claude Code extension on Cursor’s extension marketplace was the result of the theft of an access key that was exposed in the wake of a breach targeting Fireworks AI.

“An attacker obtained an access key we had issued to Fireworks,” Cursor said in a Friday update. “The key was exposed by Fireworks, and the attacker used it to copy data from a read-only The compromise of Anthropic’s official Claude Code extension on Cursor’s extension marketplace was the result of the theft of an access key that was exposed in the wake of a breach targeting Fireworks AI.

“An attacker obtained an access key we had issued to Fireworks,” Cursor said in a Friday update. “The key was exposed by Fireworks, and the attacker used it to copy data from a read-only  The Hacker News

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