Researchers exploited a vulnerability in CodeRabbit, an AI code review tool, allowing them to achieve remote code execution (RCE) and gain read/write access to 1 million repositories. The exploitation involved creating a malicious pull request that leveraged a flaw in the integration of external static analysis tools, leading to the leakage of sensitive API tokens and secrets. CodeRabbit quickly remediated the vulnerabilities after disclosure, enhancing their security measures in response.