That’s how fast Identity-Aware Proxy (IAP) privilege escalation can happen. One small oversight in access control, and the entire security model collapses. IAP is supposed to ensure only verified identities reach protected resources. But when roles, scopes, or trust boundaries are not enforced with absolute precision, an attacker can chain seemingly low-risk permissions into a direct path to high-value systems.
The escalation pattern is almost always the same. First, an attacker gains access to an account that has narrow, legitimate permissions through IAP. Then, they find a misconfigured policy, overbroad OAuth scope, or unmanaged service account. Next, they pivot—sometimes without triggering alerts—into higher privileges, often all the way to project-level owner rights. At that point, defenses that rely on the identity perimeter are gone.
Common causes include:
- Service accounts with editor-level access exposed through misconfigured IAP bindings
- Overly broad OAuth tokens that extend beyond intended application use
- Role inheritance pitfalls where low-level roles have hidden escalation paths
- Missing monitoring for behavioral anomalies inside IAP traffic
Defending against IAP privilege escalation requires both precision and visibility. Precise access means granting the minimum set of roles, reviewing inherited permissions, and avoiding the temptation to use wildcard access for speed. Visibility means having continuous audit logs, scope monitoring, and active testing of privilege boundaries before attackers do.