OIDC Tokens Can Now Restrict Which AWS Roles They Assume

A new AWS STS capability allows OIDC identity providers to embed an explicit list of authorized IAM roles directly in OIDC tokens. AWS validates that the requested role matches the token's roles claim before evaluating trust policies, adding an extra layer of defense against unauthorized role assumption. This enables identity providers to enforce finer-grained access control and simplify permission management for federated identities. 

https://awsteele.com/blog/2026/07/13/oidc-tokens-can-restrict-which-aws-roles-they-assume.html

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