CVE-2026-55689: OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset

June 19, 2026

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.

References

github.com/advisories/GHSA-hcxc-wf8j-23hv
github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hv
nvd.nist.gov/vuln/detail/CVE-2026-55689

Code Behaviors & Features

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