Vulnerabilities in pkg:golang/github.com/openfga/openfga

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g3pg-frfm-pr2m",
  "modified" : "2026-09-16T22:15:09Z",
  "published" : "2026-09-16T22:15:09Z",
  "aliases" : [ "CVE-2026-61709" ],
  "summary" : "OpenFGA: ListUsers returns a deliberately-excluded user when a `but not` exclusion under a type-bound wildcard is intersected (`and`) with another relation that also grants that user",
  "details" : "### Description\n\nIn OpenFGA, the ListUsers API could incorrectly return a user who should have been excluded.\n\n\n### Preconditions\n\nThis applies if all of the following are present:\n\n- The authorization model contains a relation defined as an intersection (and) where at least one operand is an exclusion of the form base but not excluded: e.g. `rel1: (public_user but not blocked) and rel2`\n- The base side of that exclusion is granted through a type-bound public wildcard (e.g. user:*).\n- A user excluded by the but not clause is also granted, via a concrete tuple, through another operand of the intersection.\n- Your application uses ListUsers to enumerate or enforce access\n\n### Fix\n\nUpgrade to OpenFGA v1.18.1 or greater.\n\n### Acknowledgements\n\nOpenFGA would like to thank @5ud0er for the detailed report.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/openfga/openfga"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.18.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.18.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-61709"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9ac3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openfga/openfga"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openfga/openfga/releases/tag/v1.18.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-281", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-16T22:15:09Z",
    "nvd_published_at" : "2026-09-16T15:17:39Z"
  }
}