GHSA-HCXC-WF8J-23HV

Vulnerability from github – Published: 2026-06-19 14:35 – Updated: 2026-07-21 14:52
VLAI
Summary
OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset
Details

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.

Severity
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.17.1"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openfga/openfga"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55689"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T14:35:35Z",
    "nvd_published_at": "2026-07-09T22:17:06Z",
    "severity": "MODERATE"
  },
  "details": "## Description\n\nOpenFGA\u0027s 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.",
  "id": "GHSA-hcxc-wf8j-23hv",
  "modified": "2026-07-21T14:52:50Z",
  "published": "2026-06-19T14:35:35Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset"
}



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