A long-lived authentication credential used to publish or manage packages in a repository. In NHI governance, the risk is not only theft but persistence, because an unrevised token can remain valid after newer controls are added and can bypass the intended identity path.
Expanded Definition
A legacy publishing token is a long-lived credential used to authenticate package publishing or repository management tasks. In NHI governance, it is not just an access secret but a persistence risk: once embedded in CI/CD, build scripts, or automation tooling, it can outlive the control model that now governs newer identities. That makes it different from a modern short-lived token or federated workload identity, where rotation and expiry are built into the operating pattern. NIST SP 800-53 Rev. 5 emphasizes secret and credential management controls, but definitions vary across vendors on whether a publishing token should be treated as a package-repository secret, an API key, or a privileged automation credential. NHI Management Group treats the term as an operational category defined by its blast radius and lifespan, not by the vendor label attached to it. The most common misapplication is leaving a legacy publishing token in active use after migration to newer identity controls, which occurs when teams assume the old token is harmless because publishing still succeeds.
For background on why persistent secrets remain dangerous even after modernization efforts, see the Guide to the Secret Sprawl Challenge and NIST’s NIST SP 800-53 Rev 5 Security and Privacy Controls.
Examples and Use Cases
Implementing legacy token retirement rigorously often introduces release friction, requiring organisations to weigh developer convenience against revocation discipline and auditability.
- A package maintainer keeps an old publishing token active while moving to federated CI, so the legacy path remains usable long after the new workflow is approved.
- A build pipeline stores the token in a repository variable and reuses it across multiple projects, which creates a broad blast radius if the token is exposed.
- An engineering team rotates container registry credentials but forgets the package repository token, leaving one unmanaged identity path behind.
- A third-party release automation tool caches the token locally, creating a shadow copy that survives team changes and repository restructuring.
These patterns mirror real-world token persistence and secret exposure incidents, including the Salesloft OAuth token breach, where compromised credential material enabled downstream access. For broader context on secret exposure in modern delivery systems, GitGuardian’s The State of Secrets Sprawl 2026 shows how often valid secrets remain exploitable after discovery.
Why It Matters in NHI Security
Legacy publishing tokens matter because they create a false sense of control. An organisation may believe it has moved to stronger identity governance, yet the old token still bypasses RBAC, JIT, and workload identity guardrails. That is especially dangerous in NHI environments where a single token may publish packages, alter deployment artifacts, or inject malicious dependencies into multiple environments. NHIMG research shows the scale of the persistence problem: 91% of former employee tokens remain active after offboarding, and 44% of NHI tokens are exposed in the wild, often in tickets, chat, or code commits. Those figures illustrate that the problem is not limited to theft. It is also about forgotten validity and duplicated trust paths. The right control response is lifecycle ownership, inventory, revocation testing, and migration to short-lived, identity-bound publishing flows, supported by monitoring for token use outside approved pipelines. Organisations typically encounter the operational impact only after a compromised release, at which point legacy publishing token cleanup becomes operationally unavoidable to address.
See also the JetBrains GitHub plugin token exposure for a case where exposed credentials became a software supply chain issue, and the Guide to the Secret Sprawl Challenge for practical patterns that reduce hidden secret accumulation.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-63, NIST Zero Trust (SP 800-207) and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Covers improper secret handling and persistent credential exposure in NHI systems. |
| NIST CSF 2.0 | PR.AA | Addresses identity and access governance for privileged non-human credentials. |
| NIST SP 800-63 | Provides digital identity assurance concepts relevant to token strength and lifecycle. | |
| NIST Zero Trust (SP 800-207) | Zero trust requires continuous verification rather than trust in a standing secret. | |
| NIST AI RMF | Supports risk-based governance for automated systems that depend on persistent credentials. |
Inventory, rotate, and revoke publishing tokens; eliminate long-lived secrets from build and release paths.
