GetSessionToken is an API call that exchanges long-lived AWS credentials for temporary session credentials. It returns a short-lived access key, secret key, and session token that can be used for scoped actions, often with an optional session policy and duration limit.
What GetSessionToken Does in AWS
GetSessionToken is a short-term credential exchange in AWS STS. It takes long-lived AWS credentials and returns temporary session credentials that can be used for scoped actions, which reduces the exposure window of the original credentials.
That pattern matters because the security value is not just “temporary access”, it is delegated access with a shorter lifetime and a tighter blast radius. The session can be constrained by duration and, when used correctly, can support more controlled downstream access than a standing secret.
How Session Credentials Change the Security Posture
Temporary session credentials shift risk away from static, reusable material and toward time-bounded, purpose-bounded use. When the session is issued for a narrow task, the resulting credentials are harder to reuse indefinitely and easier to contain if they are exposed.
The trade-off is that the temporary credentials are still powerful until they expire, so their protection and handling remain critical. If they are logged, copied into automation, or passed into untrusted tooling, the original reduction in exposure can be undermined by misuse of the session itself.
A good way to think about GetSessionToken is as a controlled handoff, not a security boundary by itself. It helps when the original credentials must remain long-lived for compatibility, but the active work should proceed under a shorter-lived session.
Where GetSessionToken Fits in Credential Lifecycle
GetSessionToken is part of the broader lifecycle of AWS credentials, especially where operators need to authenticate once and then work through temporary credentials for a defined window. It is most useful when teams need to reduce standing credential exposure without redesigning the entire access model at once.
For readers comparing this with other AWS session patterns, the important distinction is that the call is about exchanging one set of credentials for another with different lifetime and scope characteristics. That makes it a lifecycle control as much as an authentication mechanism.
Used well, it supports rotation-adjacent discipline because the temporary session becomes the active working credential while the longer-lived source credential stays out of the steady-state path. That reduces the number of places where durable AWS secrets need to be stored or handled.
Operational Considerations for Secure Use
GetSessionToken works best when organizations treat the source credentials as sensitive bootstrap material and the returned session as a limited-use artifact. The session should be issued only for the workflow that needs it, then allowed to expire naturally rather than being reused broadly.
The AWS STS and AssumeRole Guide is a useful companion when you want the wider STS trust model, including session tags, source identity, role chaining and revocation patterns, explained in one place. The same discipline applies here: keep the exchange narrow, predictable and auditable.
In practice, that means checking where long-lived AWS credentials are still required, where temporary credentials are actually being consumed, and whether the application path preserves the intended session scope. If the downstream workload cannot tolerate short-lived credentials, the design usually needs to be revisited rather than extending the session indefinitely.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Covers credential issuance, storage, and lifecycle handling for temporary AWS session credentials. |
| IA-9 — Service Identification and Authentication | Applies when AWS services and automated workloads exchange or use temporary credentials for authenticated access. | |
| AC-6 — Least Privilege | Session credentials are meant to narrow what an active credential can do, which is a least-privilege control outcome. | |
| Recommendation — Use IA-5 to govern issuance, storage, rotation, and revocation of the source credentials and resulting session material. Use IA-9 to authenticate workloads and services that consume temporary AWS session credentials. Apply AC-6 to scope temporary AWS session credentials to the minimum actions needed for the task. | ||
| NIST Zero Trust (SP 800-207) | Zero Trust Architecture | Temporary credentials align with the zero-trust idea of limiting implicit trust and reducing standing access. |
| Recommendation — Use zero-trust principles to minimize standing AWS access and rely on short-lived credentials where possible. | ||
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Reviewed and updated by the NHIMG editorial team on October 29, 2026.
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