AWS Cached Access Key on Single Windows Machine Exposes 98% of Cloud Entities

Consider a cached access key on a single Windows machine that was automatically stored after a user logged in, following standard AWS behavior. The key was easily accessible to a minor‑league attacker and could open a path to 98% of entities in the company's cloud environment. No misconfiguration or policy violation was involved, illustrating the risk of cached credentials. The attacker could use the key to access resources across the majority of accounts.

AWS recommends rotating credentials and implementing stricter access controls. Administrators should audit cached keys and enforce least‑privilege policies. The incident highlights the importance of monitoring credential usage and limiting local storage. Failure to address this could lead to widespread data exposure.