An ecosystem name for IdP-mediated app-to-app authorization in enterprise environments. It allows an identity provider to approve or deny AI app connections centrally, reducing hidden delegation and making downstream access revocable from one place instead of inside every connected tool.
Expanded Definition
Cross App Access is an ecosystem term for IdP-mediated app-to-app authorization in enterprise environments. Instead of allowing each AI app, integration, or service account to establish opaque downstream trust on its own, the identity provider becomes the central policy point that can approve, deny, or revoke those connections. This matters in NHI governance because the access relationship is no longer hidden inside every tool; it is expressed through identity control, policy, and auditability. The concept aligns closely with the direction of the OWASP Non-Human Identity Top 10, especially where secret sprawl and unmanaged delegation create weak points. Definitions vary across vendors, and no single standard governs this yet, so the practical meaning should be read as centralised authorization for application-to-application access rather than a new credential type. The most common misapplication is treating Cross App Access as a branding layer over existing app trust, which occurs when teams keep local tokens and delegated grants unmanaged behind the IdP.
Examples and Use Cases
Implementing Cross App Access rigorously often introduces policy-design and integration overhead, requiring organisations to weigh central revocation and visibility against the effort of normalising every app connection.
- An AI assistant requests access to a CRM and document repository, and the IdP approves only the specific scopes needed for a single workflow.
- A finance automation tool is blocked from reaching payroll data until the identity team validates business need and logs the delegation.
- An internal LLM agent uses a brokered connection to call a ticketing system, with the IdP enforcing time-bound consent and revocation.
- A third-party analytics app is disconnected centrally after the relationship is reviewed, rather than requiring manual changes inside each downstream app.
- A security team maps app-to-app grants to lessons from the Ultimate Guide to NHIs and compares implementation patterns with the NIST Cybersecurity Framework for governance and access control.
Why It Matters in NHI Security
Cross App Access matters because unmanaged application delegation is a common path to hidden privilege, weak offboarding, and secrets exposure. NHI Mgmt Group reports that only 20% of organisations have formal processes for offboarding and revoking API keys, which shows how often app-to-app trust survives long after it should be removed. Centralised authorization helps reduce that gap by making access reviewable and revocable from one place, which is essential when service accounts, AI agents, and integrations operate at machine speed. The same control also supports Zero Trust thinking because every downstream grant becomes a policy decision instead of a permanent assumption. For implementation guidance, teams should compare the model with NIST Zero Trust Architecture and the practical lessons in 52 NHI Breaches Analysis. Organisations typically encounter the need for Cross App Access only after a delegated app is abused or must be emergency-disconnected, at which point the term 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 Zero Trust (SP 800-207) and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Covers secret sprawl and unmanaged app-to-app trust risks in NHI systems. |
| NIST Zero Trust (SP 800-207) | Defines policy-based access decisions aligned to Zero Trust principles for app connections. | |
| NIST CSF 2.0 | PR.AC-4 | Access permissions management maps to controlling and reviewing machine-to-machine authorization. |
Centralise app authorization, reduce hidden delegation, and review downstream grants regularly.
