They create risk because they bypass the assumptions that network defenses rely on. A valid token, broad OAuth grant, or unused service account can be exercised from anywhere, often without triggering proxy or ZTNA controls. Once an attacker finds one weak link, they can chain authorized integrations, impersonate trusted identities, and move data through normal application workflows.
Why over-scoped SaaS grants and dormant tokens are so dangerous
Broad SaaS grants and dormant tokens are dangerous because they turn delegated trust into reusable access that can outlive the person, app, or workflow that originally received it. A token with excessive scope can be exercised from outside normal network controls, and a dormant credential often looks legitimate even when no one is actively watching it.
That changes the attack model. Instead of breaking through perimeter defences, an attacker only needs to find one valid grant, token, or forgotten integration point and then operate as a trusted principal inside the SaaS workflow.
How attackers use that trust against you
Third-party attackers often prefer these paths because they blend into ordinary business activity. OAuth grants, API tokens, and service credentials can let them call approved endpoints, read data, trigger automation, or pivot into connected applications without the friction that usually surrounds interactive sign-in.
AI-driven attacks make that problem worse because automation speeds up discovery and chaining. Once an attacker or agent finds one weak grant, it can enumerate adjacent permissions, harvest more access, and move laterally through integrations that were never meant to be used together at that scale.
That is why token theft, overprivileged grants, and unmanaged third-party access repeatedly show up in SaaS compromise chains such as the Salesloft OAuth token breach and the Klue OAuth Supply Chain Breach. They are also a core pattern in the The 52 NHI Breaches Report, which shows how valid credentials and delegated trust are routinely abused as the first step in compromise.
What makes the blast radius so large
The blast radius grows when the grant is broader than the task, longer-lived than the business need, or connected to a high-trust integration. A dormant token is especially risky because it can be activated long after issuance, often with no recent user behaviour to compare against and no immediate signal that the business owner still expects it to exist.
Over-scoped SaaS access also collapses separation between systems. If one token can read mail, export files, invoke admin APIs, or reach downstream apps, a single compromise can expose data, impersonate workflows, and push malicious actions through normal application logic instead of through noisy exploitation techniques.
This is the same structural weakness behind cases such as the Dropbox Sign breach and the Snowflake breach: once a trusted credential or integration path is abused, the attacker inherits the privileges and business reach of that trust relationship.
Risk and Threat Considerations
These issues are high risk because they weaken both prevention and detection. Network controls may not see the activity, SaaS logs may only show legitimate API use, and the attacker can hide inside normal workflows while harvesting data or chaining access across third-party services.
Failure mechanism: Excessive grants and dormant tokens create standing, reusable access that survives the original business context, so compromise of one secret or integration can unlock multiple downstream SaaS systems.
Impact: The result can be silent data exfiltration, unauthorized workflow execution, privilege expansion across connected apps, and difficult-to-contain third-party or AI-assisted compromise.
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, OWASP Agentic AI Top 10 and MITRE ATT&CK address the attack and risk surface, while CIS Controls v8 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 — Secret Leakage | Over-scoped grants and dormant tokens expose reusable secrets. |
| NHI-05 — Overprivileged NHI | Excessive SaaS scopes create privilege that outlives need. | |
| NHI-07 — Long-Lived Secrets | Dormant tokens remain valid long after issuance and raise exposure. | |
| Recommendation — Rotate exposed tokens and remove stale grants before attackers can reuse them. Constrain SaaS grants to least privilege and review scope regularly. Set expiration and revocation policies for long-lived tokens and service credentials. | ||
| OWASP Agentic AI Top 10 | ASI03 — Identity & Privilege Abuse | AI-driven attacks abuse trusted identities and delegated permissions. |
| Recommendation — Limit delegated access and monitor for abnormal privilege use by agents. | ||
| MITRE ATT&CK | T1550 — Use Alternate Authentication Material | Attackers reuse stolen tokens and keys to act as trusted principals. |
| T1098 — Account Manipulation | Broad grants let attackers alter access and persist through SaaS workflows. | |
| Recommendation — Hunt for reused tokens and revoke alternate authentication material quickly. Audit account and integration changes for unauthorized access expansion. | ||
| CIS Controls v8 | CIS-5 — Account Management | Stale tokens and unused grants are account management weaknesses. |
| CIS-6 — Access Control Management | Least-privilege SaaS grants directly map to access control management. | |
| Recommendation — Remove inactive accounts and credentials on a fixed review cadence. Restrict SaaS permissions to the minimum required for each integration. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Tokens and API credentials need lifecycle control, rotation and revocation. |
| AC-6 — Least Privilege | Over-scoped grants violate least-privilege access expectations. | |
| Recommendation — Enforce credential rotation, revocation and expiry for all non-interactive access. Reduce granted permissions to the smallest set needed for the task. | ||
Practitioner Guidance
What to prioritise: Start with tokens and grants that can reach production data, administrative APIs, or cross-tenant integrations. Those are the access paths that matter most because they combine low-friction abuse with high blast radius.
What to verify: Every active grant should have a current owner, a clear business purpose, an expiry or review date, and a scope that matches the minimum required action set. If you cannot explain why a token still exists, treat it as suspect until proven otherwise.
Common mistake: Teams often focus on user login hygiene and overlook non-interactive access. The real danger is not just a stolen credential, it is a valid credential that still works exactly as designed after the original need has disappeared.
Practitioner takeaway: The right question is not whether the token is technically valid, but whether it should still be trusted to act on behalf of the business right now.
Related resources from NHI Mgmt Group
- Why do ransomware and AI-driven attacks create such high risk for financial services?
- Why do leaked API tokens create such high cost risk in AI application platforms?
- Why do third-party data sprawl and shared links create such high breach risk?
- Why do third-party vendors create such high compliance and security risk for organisations?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
