{"cve":"CVE-2026-61709","nvd":{"published":"2026-09-16T15:17:39.660","modified":"2026-09-24T21:25:27.050","status":"Deferred","description":"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 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","score":5.3},"cwes":["CWE-281","CWE-863"],"references":["https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9ac3","https://github.com/openfga/openfga/releases/tag/v1.18.1","https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-61709","score":0.00351,"percentile":0.28803,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-g3pg-frfm-pr2m","url":"https://osv.dev/vulnerability/GHSA-g3pg-frfm-pr2m","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","modified":"2026-09-28T17:11:12.964165497Z","packages":[{"ecosystem":"Go","name":"github.com/openfga/openfga","purl":"pkg:golang/github.com/openfga/openfga","ranges":["<1.18.1"],"fixed":["1.18.1"]}]},{"id":"GO-2026-6488","url":"https://osv.dev/vulnerability/GO-2026-6488","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 in github.com/openfga/openfga","modified":"2026-09-28T17:00:17.351799519Z","packages":[{"ecosystem":"Go","name":"github.com/openfga/openfga","purl":"pkg:golang/github.com/openfga/openfga","ranges":["<1.18.1"],"fixed":["1.18.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}