Credential material is any secret data that proves identity or grants access, such as API tokens, SSH keys, session cookies, signing keys, or cloud credentials. Unlike source code, these values are meant to stay private and are often stored in vaults, environment variables, or short-lived automation systems. If an attacker steals credential material, they may be able to enter internal services, impersonate developers, or sign and publish malicious updates.
In cyber security, credential material matters because it is a high-value target in both direct intrusions and supply-chain attacks. Attackers often search repositories, build logs, CI jobs, developer laptops, and cached artifacts for exposed secrets. Defenders reduce risk with secret scanning, least-privilege access, short-lived tokens, strong rotation and revocation procedures, and strict separation between untrusted code and privileged release workflows. Treating credential material as sensitive metadata is not enough; it must be protected like a production key.