GHSA-hcxc-wf8j-23hv OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset

• Go github.com/openfga/openfga: < 1.18.0 → fixed in 1.18.0

Description OpenFGA's OIDC authenticator skipped JWT audience (`aud`) validation when no audience was configured. In deployments where one identity provider issues tokens for multiple services, a token minted for an unrelated service could authenticate to OpenFGA. Preconditions This applies if the following preconditions are met: 1. You run OpenFGA with `authn.method` set to `oidc`. 2. You configured `authn.oidc.issuer` but did not set `authn.oidc.audience` (`--authn-oidc-audience` / `OPENFGA_AUTHN_OIDC_AUDIENCE`). Fix Upgrade to OpenFGA 1.18.0 or greater. OpenFGA now refuses to start in `oidc` mode unless both `authn.oidc.issuer` and `authn.oidc.audience` are set, and the `aud` claim is always validated. Acknowledgements OpenFGA would like to thank https://github.com/0xVijay for the report.