Mercedes-Benz accidentally exposed a trove of internal data after leaving a private key online that gave “unrestricted access” to the company’s source code, according to the security research firm that discovered it. Shubham Mittal, co-founder and chief technology officer of RedHunt Labs, alerted TechCrunch to the exposure and asked for help in disclosing to the car maker. The London-based cybersecurity company said it discovered a Mercedes employee’s authentication token in a public GitHub repository during a routine internet scan in January.