A publishing token is a secret credential that lets a maintainer or automation system upload or publish a software package release to a registry such as PyPI, npm, or a private artifact store. It usually acts like a password for release operations, so anyone who obtains it may be able to replace or add package files without needing the full account login.
In cyber security, publishing tokens matter because they sit on the software supply-chain trust boundary. Attackers target them through phishing, malware on developer machines, exposed CI logs, leaked environment variables, or reused secrets in build systems. If stolen, a token can be used to poison a package release, inject malicious code, or tamper with an older version that users still trust. Defenses include scoped tokens, short lifetimes, secret rotation, access logging, and restricting uploads to approved automation paths.