A 7-year-old critical remote code execution vulnerability has been discovered in iTerm2 macOS terminal emulator app—one of the most popular open source replacements for Mac’s built-in terminal app.

Tracked as CVE-2019-9535, the vulnerability in iTerm2 was discovered as part of an independent security audit funded by the Mozilla Open Source Support Program (MOSS) and conducted by cybersecurity firm Radically Open Security (ROS).

”MOSS selected iTerm2 for a security audit because it processes untrusted data, and it is widely used, including by high-risk targets (like developers and system administrators),” Mozilla says.