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OpenFGA: Unauthenticated playground endpoint discloses preshared API key in HTML response

Moderate severity GitHub Reviewed Published Apr 8, 2026 in openfga/openfga • Updated Apr 24, 2026

Package

gomod github.com/openfga/openfga (Go)

Affected versions

>= 0.1.4, <= 1.13.1

Patched versions

1.14.0

Description

Description

When OpenFGA is configured to use preshared-key authentication with the built-in playground enabled, the local server includes the preshared API key in the HTML response of the /playground endpoint. The /playground endpoint is enabled by default and does not require authentication. It is intended for local development and debugging and is not designed to be exposed to production environments.

Am I Affected?

You are affected if you meet each of the following preconditions:

  • You are running OpenFGA with --authn-method preshared, and
  • The playground is enabled, and
  • The playground endpoint is accessible beyond localhost or trusted networks.

Fix

Upgrade to OpenFGA v1.14.0, or disable the playground by running ./openfga run --playground-enabled=false.

References

@justincoh justincoh published to openfga/openfga Apr 8, 2026
Published to the GitHub Advisory Database Apr 8, 2026
Reviewed Apr 8, 2026
Published by the National Vulnerability Database Apr 17, 2026
Last updated Apr 24, 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
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
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:L/PR:N/UI:N/S:U/C:L/I:L/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.
(25th percentile)

Weaknesses

Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Learn more on MITRE.

CVE ID

CVE-2026-40293

GHSA ID

GHSA-68m9-983m-f3v5

Source code

Credits

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