CVE-2026-55689

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

CVSS 3.1 6.8 MEDIUMEUVD CVSS 3.1 6.8 CVSS 3.1 · [email protected] · Secondary 6.8 MEDIUMCVSS 3.1 · [email protected] · Primary 8.1 HIGHCVSS_V3 Publisher rating MODERATEFixed by github.com/openfga/openfga 1.18.0osv · severity unknownFixed by github.com/openfga/openfga 1.18.0KEV status unknown

Original advisory

cve-program · CVE-2026-55689

Published

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, 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.

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euvd · EUVD-2026-42710

Published

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nvd · CVE-2026-55689

Published

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osv · 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.

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osv · GO-2026-5423

Published

OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset in github.com/openfga/openfga

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Affected versions, risk and source history

cve-program · CVE-2026-55689

Published

openfga

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "openfga",
                    "product": "openfga",
                    "versions": [
                        {
                            "version": "< 1.18.0",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-42710

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jul 9, 2026, 9:06:22 PM

dateUpdated: Jul 10, 2026, 1:45:39 PM

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

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nvd · CVE-2026-55689

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-287

Original publisher date fields

published: 2026-07-09T22:17:06.553

lastModified: 2026-07-14T01:28:44.147

2 source CPE criteria · context only

cpe:2.3:a:openfga:helm_charts:*:*:*:*:*:openfga:*:*
cpe:2.3:a:openfga:openfga:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

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osv · GHSA-hcxc-wf8j-23hv

Published

github.com/openfga/openfga

SEMVER · introduced 0 → fixed 1.18.0

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osv · GO-2026-5423

Published

github.com/openfga/openfga

SEMVER · introduced 0 → fixed 1.18.0

Original source record · Cite this exact observation · Complete original publisher JSON