OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset
## 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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-55689US | high8.1 | — | ||
OpenFGA is an authorization/permission engine built for developers. Prior to 1.18.0, OpenFGA's OIDC authenticator skipped JWT audience validation when authn.method was set to oidc,… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/openfga/helm-chWEB
- https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9WEB
- https://github.com/openfga/openfgaPACKAGE
- https://github.com/openfga/openfga/commit/44596773b2e62738720ef215bf7fa04352954271WEB
- https://github.com/openfga/openfga/releases/tag/v1.18.0WEB
- https://github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hvWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-55689ADVISORY
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