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

Moderate severity GitHub Reviewed Published Jun 18, 2026 in openfga/openfga • Updated Jul 21, 2026

Package

gomod github.com/openfga/openfga (Go)

Affected versions

<= 1.17.1

Patched versions

1.18.0

Description

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.

References

@justincoh justincoh published to openfga/openfga Jun 18, 2026
Published to the GitHub Advisory Database Jun 19, 2026
Reviewed Jun 19, 2026
Published by the National Vulnerability Database Jul 9, 2026
Last updated Jul 21, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(34th percentile)

Weaknesses

Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Learn more on MITRE.

CVE ID

CVE-2026-55689

GHSA ID

GHSA-hcxc-wf8j-23hv

Source code

Credits

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