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EUVD-2026-158050

fkie_cve-2024-42473

OpenFGA is an authorization/permission engine. OpenFGA v1.5.7 and v1.5.8 are vulnerable to authorization bypass when calling Check API with a model that uses `but not` and `from` expressions and a userset. Users should downgrade to v1.5.6 as soon as possible. This downgrade is backward compatible. As of time of publication, a patch is not available but OpenFGA's maintainers are planning a patch for inclusion in a future release.

GHSA-3f6g-m4hr-59h8 — OpenFGA Authorization Bypass

Affected: Go: github.com/openfga/openfga

## Overview

OpenFGA v1.5.7 and v1.5.8 are vulnerable to authorization bypass when calling Check API with a model that uses `but not` and `from` expressions and a userset.

## Fix

- If you are using OpenFGA within Docker or as a Go library, as a binary, or through Docker, upgrade to v1.5.9 as soon as possible - If using Helm chart, upgrade to 0.2.12 as soon as possible.

This fix is backward compatible.