Encrypted instructions trick Copilot CLI into spilling developer secrets
GitHub Copilot CLI can be made to read sensitive files from a developer’s machine and send their contents to an attacker from a single web page. Security researchers at Adversa AI said the new attack technique, dubbed Cryptographic Context Injection (CCI), hides malicious…
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According to Adversa, the attack is not a universal one-click compromise as it requires Copilot CLI to be running in autopilot mode and a model willing to execute the decrypted instructions. GitHub has validated the finding but declined to treat it as a vulnerability, saying the user had explicitly asked Copilot to fetch attacker-controlled content while giving full permissions to act autonomously.
“They noted they may make the functionality stricter in the future but had nothing to announce, and ruled the report ineligible for the GitHub bug bounty program,” Adversa said. The researchers disputed that assessment, arguing that it does not explain why Copilot rejects the same instructions when presented in plaintext but accepts them after they have been encrypted and decrypted within its execution environment.
GitHub did not immediately respond to CSO’s request for comment.
