An arbitrary file read is a flaw that lets an attacker read files they should not access on the target system. In NHI environments, the impact often goes beyond information disclosure because the files may contain session secrets, database contents, or keys that enable impersonation or escalation.
Expanded Definition
An arbitrary file read is usually discussed as an access-control flaw, but in NHI environments it often behaves like a secret-exposure pathway. The issue allows a requester to retrieve local or adjacent files that should remain outside their authority, including configuration files, logs, credential stores, and application metadata. Definitions vary across vendors on whether a path traversal, local file inclusion, or direct object reference counts as the same weakness, so the practical test is whether unauthorized file content can be read.
For NHI operations, the distinction matters because a readable file may hold API keys, private certificates, session material, or deployment settings that expose service relationships. Guidance from the NIST Cybersecurity Framework 2.0 is useful here because this flaw usually breaks both protective access boundaries and the integrity of controlled data handling. The most common misapplication is treating it as a narrow web bug, which occurs when teams ignore filesystem exposure inside containers, CI runners, or internal tools that still process sensitive NHI material.
Examples and Use Cases
Implementing detection and containment rigorously often introduces debugging friction, requiring organisations to weigh fast troubleshooting against the risk of exposing sensitive files to runtime readers.
- A webhook service reads a debug parameter and returns the contents of a mounted config file, exposing database credentials used by an internal agent.
- An internal admin portal allows download of log archives, and those logs contain bearer tokens, temporary session secrets, or references to secret paths.
- A containerized workload can read service account files or environment snapshots, letting an attacker pivot from a single request to broader NHI impersonation.
- A build pipeline writes artifacts into a shared directory, and a file-read flaw exposes signed manifests, private keys, or deployment variables before rotation.
- A file preview feature accepts user-controlled paths, making it possible to inspect local files that reveal how an Ultimate Guide to NHIs describes as vulnerable secret storage patterns.
In practice, these cases are often evaluated alongside the NIST Cybersecurity Framework 2.0 because the control failure is not just the read itself, but the absence of file-scoping, validation, and monitoring around the identity that can trigger it.
Why It Matters in NHI Security
Arbitrary file read becomes especially serious in NHI security because files are frequently where secrets, trust material, and automation context accumulate. An attacker who can read a single file may not need to attack the identity layer directly if the file reveals credentials, token lifetimes, vault endpoints, or deployment scripts that map the environment. That is why NHI controls increasingly treat file exposure as a governance issue, not only an application bug, and why the Ultimate Guide to NHIs emphasizes visibility, rotation, and offboarding discipline.
One NHIMG stat underscores the scale of the problem: 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools, according to Ultimate Guide to NHIs. In that environment, arbitrary file read can turn a minor information disclosure into credential theft, lateral movement, or service impersonation. Organisations typically encounter the real impact only after a secret leak, failed rotation, or unexplained access event, at which point arbitrary file read becomes operationally unavoidable to address.
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 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Directly covers secret exposure and insecure secret handling in NHI systems. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access and access enforcement are central to preventing unauthorized file reads. |
| NIST Zero Trust (SP 800-207) | AC-6 | Zero Trust requires explicit authorization for each resource, including files and mounted secrets. |
Restrict file reads, remove embedded secrets, and audit secret locations continuously.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on May 26, 2026.
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