Wildcard Permissions matter because broad grants can unintentionally allow more actions or resources than intended. Attackers often exploit over-permissioned identities after initial access. Security teams should search for wildcard patterns in policies, compare them with actual use, and tighten permissions to the smallest practical scope with explicit review for exceptions.
How wildcard permissions change the security problem
wildcard permissions are not just a convenience issue, they change the shape of access control. A policy that matches “all” or “*” can silently expand what an identity can read, change, delete, or assume, especially when the policy language allows resource, action, or condition wildcards. That makes permission review harder because the real effective access is broader than the policy may first appear.
For security teams, the key concern is blast radius. If a compromised identity carries wildcard access, the attacker does not need to find a second weakness to move from initial access to meaningful impact. The same broad grant that speeds administration can also speed privilege abuse, lateral movement, and data exposure.
Where wildcard permissions become operationally dangerous
Wildcard permissions are most dangerous when they sit in high-value paths such as admin roles, automation identities, shared service access, or cloud policies that span multiple resources or accounts. They are also risky when teams assume a wildcard is harmless because “it is only for now” or “the application needs flexibility,” then forget to narrow it later.
The practical failure mode is mismatch between intended use and effective use. A team may grant a policy to support a narrow workflow, but the wildcard later covers additional APIs, buckets, secrets, queues, or administrative operations. NHIMG’s Cloud PAM and CIEM Guide is useful here because it focuses on effective permissions, rightsizing, and cloud privilege control rather than just assigned entitlements.
In cloud environments, wildcard access often intersects with privilege escalation paths, not just overbroad read access. The issue is less “does the policy look messy” and more “can this principal do something the business never intended, especially after compromise?”
How to review and reduce wildcard exposure
Start by comparing declared permissions with actual usage. Wildcard grants are easiest to justify when you can prove the identity only uses a small, stable subset of what it could do. If you cannot show that pattern clearly, the policy is probably larger than the workload or user needs.
Security teams should then tighten permissions to the smallest practical scope and preserve exceptions only when they are explicitly owned, time-bounded, and reviewed. NHIMG’s Authorisation Models Guide helps when the right fix is not just “less access,” but a better model for expressing intent through roles, attributes, relationships, or policy-based controls.
Where wildcard permissions support privileged workflows, pair the review with stronger access governance. NHIMG’s Privileged Access Management Guide is relevant because wildcard permissions matter most when they are attached to privileged identities that can change systems, data, or security controls.
Risk and Threat Considerations
Wildcard permissions increase the chance that a single compromised identity can reach many resources or perform multiple actions without needing further escalation. That creates a larger attack surface, makes abuse easier to scale, and weakens the value of least privilege as a containment control.
Failure mechanism: An attacker who obtains a token, session, or credential tied to a wildcard policy can enumerate broader actions or resources than the original workflow required, then use the excess scope to exfiltrate data, alter configuration, or pivot into more privileged paths.
Impact: The result can be wider data exposure, unauthorized modification, harder incident scoping, and faster post-compromise movement because the policy itself has already expanded the attacker’s options.
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 addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-6 — Least Privilege | Wildcard permissions expand access beyond intended necessity. |
| AC-2 — Account Management | Broad permissions are often tied to poorly governed accounts and roles. | |
| IA-5 — Authenticator Management | If a wildcard grant is abused, credential lifecycle and rotation become part of containment. | |
| Recommendation — Restrict wildcard grants to the minimum access required. Review account and role assignments to remove unnecessary wildcard access. Rotate or revoke exposed credentials when wildcard access may have been abused. | ||
| CIS Controls v8 | CIS-6 — Access Control Management | Wildcard permissions are an access-control weakness that CIS 6 directly addresses. |
| Recommendation — Implement and enforce least privilege for all permissions, including wildcard patterns. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Wildcard permissions are a classic overprivilege pattern for non-human identities. |
| Recommendation — Audit NHI policies for wildcard grants and shrink them to task-specific scope. | ||
Practitioner Guidance
What to prioritise: Review wildcard permissions first on identities that can reach production data, administrative APIs, or cross-environment resources. Those are the policies most likely to turn a small compromise into a major incident.
What to verify: Confirm that every wildcard grant has a current business owner, a documented reason, and evidence that the wildcard is still necessary. If the permission exists only because no one has revisited it, treat it as a remediation candidate rather than a tolerated default.
Decision rule: If an identity can do something materially harmful with one wildcard grant, narrow the scope before relying on monitoring to detect abuse. Monitoring is useful, but it is not a substitute for removing avoidable excess access.
Practitioner takeaway: Wildcard permissions are a security problem when they turn uncertain intent into broad effective authority; the right control is not simply review, but continuous rightsizing against real use.