{"id":"GHSA-hcxc-wf8j-23hv","summary":"OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset","details":"## Description\n\nOpenFGA's OIDC authenticator skipped JWT audience (`aud`) validation when no audience was configured.\nIn deployments where one identity provider issues tokens for multiple services,\na token minted for an unrelated service could authenticate to OpenFGA.\n\n## Preconditions\n\nThis applies if the following preconditions are met:\n\n1. You run OpenFGA with `authn.method` set to `oidc`.\n2. You configured `authn.oidc.issuer` but did **not** set\n   `authn.oidc.audience` (`--authn-oidc-audience` / `OPENFGA_AUTHN_OIDC_AUDIENCE`).\n\n## Fix\n\nUpgrade to OpenFGA 1.18.0 or greater. OpenFGA now refuses to start in `oidc`\nmode unless both `authn.oidc.issuer` and `authn.oidc.audience` are set, and the\n`aud` claim is always validated.\n\n## Acknowledgements\n\nOpenFGA would like to thank https://github.com/0xVijay for the report.","aliases":["CVE-2026-55689","GO-2026-5423"],"modified":"2026-07-21T15:00:29.327232865Z","published":"2026-06-19T14:35:35Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-06-19T14:35:35Z","nvd_published_at":"2026-07-09T22:17:06Z","cwe_ids":["CWE-287"]},"references":[{"type":"WEB","url":"https://github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55689"},{"type":"WEB","url":"https://github.com/openfga/openfga/commit/44596773b2e62738720ef215bf7fa04352954271"},{"type":"WEB","url":"https://github.com/openfga/helm-ch"},{"type":"WEB","url":"https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9"},{"type":"PACKAGE","url":"https://github.com/openfga/openfga"},{"type":"WEB","url":"https://github.com/openfga/openfga/releases/tag/v1.18.0"}],"affected":[{"package":{"name":"github.com/openfga/openfga","ecosystem":"Go","purl":"pkg:golang/github.com/openfga/openfga"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.18.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.17.1","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-hcxc-wf8j-23hv/GHSA-hcxc-wf8j-23hv.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}