{"id":"CVE-2026-61709","title":"OpenFGA is an authorization and permission engine built for developers","summary":"OpenFGA is an authorization and permission engine built for developers. Prior to 1.18.1, the ListUsers API could return a user that should have been excluded when an authorization relation used an intersection containing a base but not e…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-281","CWE-863","CWE-783"],"vendor":"openfga","product":"openfga","affected":["openfga < 1.18.1"],"patched":["github.com/openfga/openfga 1.18.1"],"published":"2026-09-16","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:09.540","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61709","references":[{"url":"https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9ac3","label":"security-advisories@github.com"},{"url":"https://github.com/openfga/openfga/releases/tag/v1.18.1","label":"security-advisories@github.com"},{"url":"https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61709"},{"url":"https://github.com/advisories/GHSA-g3pg-frfm-pr2m"},{"url":"https://github.com/openfga/openfga"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61709.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-61709"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535473"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-61709"},{"url":"https://access.redhat.com/errata/RHSA-2026:68777"},{"url":"https://access.redhat.com/errata/RHSA-2026:68821"},{"url":"https://access.redhat.com/errata/RHSA-2026:67605"}],"tags":["nvd","cve.org","ghsa","go","osv","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T17:52:21.970517Z"},"epss":0.00336,"epssPercentile":0.27046,"aliases":["GHSA-g3pg-frfm-pr2m"],"ecosystem":"go","ingestedAt":"2026-09-16T14:57:28.065Z","slug":"CVE-2026-61709","body":"## Overview\n\nOpenFGA is an authorization and permission engine built for developers. Prior to 1.18.1, the ListUsers API could return a user that should have been excluded when an authorization relation used an intersection containing a base but not excluded operand, the base was granted through a type-bound public wildcard, and the excluded user also had a concrete tuple through another intersection operand. In pkg/server/commands/listusers/list_users_rpc.go, expandIntersection counted the concrete tuple and wildcard without first rejecting entries in excludedUsersMap. Applications that used ListUsers to enumerate or enforce access could therefore treat an excluded user as authorized. This issue is fixed in version 1.18.1.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-61709)\n\nAffected packages:\n\n- `github.com/openfga/openfga <= 1.18.0`\n\nPatched in:\n\n- `github.com/openfga/openfga 1.18.1`\n\nSource: https://github.com/advisories/GHSA-g3pg-frfm-pr2m\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Multicluster Global Hub, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat Ceph Storage 6, Red Hat Ceph Storage 7, Red Hat Ceph Storage 8, Red Hat Ceph Storage 9, … · no fix planned: Red Hat Ceph Storage 6, Red Hat Ceph Storage 9, Multicluster Global Hub, Red Hat Advanced Cluster Management for Kubernetes 2, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61709.json)\n- **RHSA-2026:68777** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68777)\n- **RHSA-2026:68821** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68821)\n- **RHSA-2026:67605** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67605)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}