Hardcoded Secret

Expanded Definition

A hardcoded secret is not just “embedded credentials.” In NHI operations, it is a credential lifecycle failure: the secret is placed into code, copied into build artifacts, and then inherited by every environment that receives that code. That creates persistence long after the original developer intent is gone.

Definitions vary across vendors on where the boundary sits between a hardcoded secret and a configuration-managed secret, but the practical distinction is whether the value can be rotated, revoked, and audited independently of the software release. OWASP’s OWASP Non-Human Identity Top 10 treats secret exposure as a core identity risk because the secret often becomes the effective identity of the workload, agent, or pipeline.

For NHI teams, the issue is not whether the secret is “hidden” in source control. It is whether the credential can be discovered, reused, and replayed across CI/CD, container images, scripts, tickets, and collaboration tools. NHIMG’s Guide to the Secret Sprawl Challenge frames this as a propagation problem, not a coding mistake. The most common misapplication is treating a hardcoded secret as acceptable because it ships only to an internal repo, which occurs when private code paths are assumed to be inherently protected.

Examples and Use Cases

Implementing secret hygiene rigorously often introduces friction in developer workflows, requiring organisations to weigh release speed against the cost of rotation, injection, and policy enforcement.

• A service account token is pasted into an application config file so a deployment “just works,” then copied into a container image and later recovered from a registry scan.
• An API key is committed to a private repository and later exposed through a dependency update, showing why private repos are not a safe exception.
• A CI job uses a long-lived credential stored in pipeline YAML, creating a reusable identity for attackers who compromise the build runner.
• A mobile app includes a backend key in its binary or build script, where reverse engineering turns an internal shortcut into an external abuse path, as discussed in the IOS app secrets leakage report.
• A team follows the intent of OWASP Non-Human Identity Top 10 style guidance by moving credentials out of code, but keeps the same static value across environments, so the secret remains reusable even after the source is cleaned up.

This pattern also appears in incidents tied to supply chain compromise, including NHIMG’s Shai Hulud npm malware campaign and the Reviewdog GitHub Action supply chain attack, where exposed values outlived the original commit.

Why It Matters in NHI Security

Hardcoded secrets break the core NHI assumption that credentials should be uniquely issued, observable, and revocable. Once a secret is written into code, it often escapes into logs, forks, snapshots, release pipelines, code search, and incident backups. That makes blast radius analysis much harder and revocation much more urgent.

The scale is no longer theoretical. In The State of Secrets Sprawl 2026, GitGuardian reported that 28.65 million new hardcoded secrets were detected in public GitHub commits in 2025 alone, a 34% year-over-year increase. That volume shows why detection must be paired with automated revocation, environment scoping, and secretless design wherever possible.

For governance, the key question is not simply “was a secret committed?” It is “where else did that secret propagate, and which NHIs can still use it?” NHIMG’s Ultimate Guide to NHIs — Static vs Dynamic Secrets explains why static values remain dangerous even after removal from source. Organisations typically encounter the full consequence only after a breach, credential replay, or build-system compromise, at which point hardcoded secret remediation becomes operationally unavoidable to address.

Related resources from NHI Mgmt Group

• What is the difference between an identity, a credential, and a secret?
• How do I find hardcoded secrets in my codebase?
• What does the hardcoded credential in a Docker image breach scenario teach us?
• What is the difference between managed identities and hardcoded secrets for AI agents?