OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset
cve-program · CVE-2026-55689
PublishedOpenFGA 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, authn.oidc.issuer was configured, and authn.oidc.audience was not set, allowing a token minted for an unrelated service by the same identity provider to authenticate to OpenFGA. This issue is fixed in 1.18.0.
Read the publisher's advisoryeuvd · EUVD-2026-42710
PublishedOpenFGA 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, authn.oidc.issuer was configured, and authn.oidc.audience was not set, allowing a token minted for an unrelated service by the same identity provider to authenticate to OpenFGA. This issue is fixed in 1.18.0.
Read the publisher's advisorynvd · CVE-2026-55689
PublishedOpenFGA 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, authn.oidc.issuer was configured, and authn.oidc.audience was not set, allowing a token minted for an unrelated service by the same identity provider to authenticate to OpenFGA. This issue is fixed in 1.18.0.
Read the publisher's advisoryosv · GHSA-hcxc-wf8j-23hv
Published## 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.
Read the publisher's advisoryosv · GO-2026-5423
PublishedOpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset in github.com/openfga/openfga
Read the publisher's advisoryAffected versions, risk and source history
Related advisories and sources
Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.
CVE-2026-55689 · CVE overview and exploitation status
cve-program · CVE-2026-55689
- https://github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hv
- https://github.com/openfga/openfga/commit/44596773b2e62738720ef215bf7fa04352954271
- https://github.com/openfga/helm-ch
- https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9
- https://github.com/openfga/openfga/releases/tag/v1.18.0
euvd · EUVD-2026-42710
- https://github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hv
- https://github.com/openfga/openfga/commit/44596773b2e62738720ef215bf7fa04352954271
- https://github.com/openfga/helm-ch
- https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9
- https://github.com/openfga/openfga/releases/tag/v1.18.0
nvd · CVE-2026-55689
- https://github.com/openfga/helm-ch
- https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9
- https://github.com/openfga/openfga/commit/44596773b2e62738720ef215bf7fa04352954271
- https://github.com/openfga/openfga/releases/tag/v1.18.0
- https://github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hv
osv · GHSA-hcxc-wf8j-23hv
- https://github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hv
- https://nvd.nist.gov/vuln/detail/CVE-2026-55689
- https://github.com/openfga/openfga/commit/44596773b2e62738720ef215bf7fa04352954271
- https://github.com/openfga/helm-ch
- https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9
- https://github.com/openfga/openfga
- https://github.com/openfga/openfga/releases/tag/v1.18.0
osv · GO-2026-5423
Related changes
Linked by CVE identifierNo related changes are available here.