{"id":"EUVD-2026-80777","revision":null,"records":[{"revision":"baa8e571a72448a0a0e89791be5f6106","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-61709","aliases":[],"title":"OpenFGA: ListUsers returns a deliberately-excluded user (authorization-decision over-inclusion) when a `but not` exclusion under a type-bound wildcard is intersected (`and`) with another relation that also grants that user","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.","state":0,"publishedAt":"2026-09-16T14:05:35.455+00:00","modifiedAt":"2026-09-18T17:52:34.349+00:00","affected":[{"ecosystem":"Vendor product","name":"openfga","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"openfga\",\n                    \"product\": \"openfga\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.18.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 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,"severity":"MEDIUM"}],"references":["https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m","https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9ac3","https://github.com/openfga/openfga/releases/tag/v1.18.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-61709","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-61709","identifiers":["CVE-2026-61709"]},"retained":false,"historicalAffected":[]},{"revision":"b05200ab909743a69bef8ad8b64a2011","observedAt":"2026-11-11T15:03:03.145+00:00","statement":{"source":"euvd","id":"EUVD-2026-80777","aliases":["CVE-2026-61709","GHSA-g3pg-frfm-pr2m"],"title":"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 excl…","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. 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Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-80777","identifiers":["EUVD-2026-80777","CVE-2026-61709","GHSA-g3pg-frfm-pr2m"]},"retained":false,"historicalAffected":[]},{"revision":"0cd7feaec2ce4a0994565c59783ce34c","observedAt":"2026-10-25T14:19:22.811+00:00","statement":{"source":"nvd","id":"CVE-2026-61709","aliases":[],"title":"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 excl…","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.","state":0,"publishedAt":"2026-09-16T15:17:39.66+00:00","modifiedAt":"2026-09-24T21:25:27.05+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61709","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-281","CWE-863"],"productCriteria":[],"sourceDates":{"published":"2026-09-16T15:17:39.660","lastModified":"2026-09-24T21:25:27.050"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-61709","identifiers":["CVE-2026-61709"]},"retained":false,"historicalAffected":[]},{"revision":"86513b1aea294267872e31a4e5ac45a5","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-g3pg-frfm-pr2m","aliases":["CVE-2026-61709","GO-2026-6488"],"title":"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","description":"### 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.","state":0,"publishedAt":"2026-09-16T22:15:09+00:00","modifiedAt":"2026-09-28T17:11:12.9641655+00:00","affected":[{"ecosystem":"Go","name":"github.com/openfga/openfga","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.18.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m","https://nvd.nist.gov/vuln/detail/CVE-2026-61709","https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9ac3","https://github.com/openfga/openfga","https://github.com/openfga/openfga/releases/tag/v1.18.1"],"sourceUrl":"https://github.com/advisories/GHSA-g3pg-frfm-pr2m","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-g3pg-frfm-pr2m","identifiers":["GHSA-g3pg-frfm-pr2m","CVE-2026-61709","GO-2026-6488"]},"retained":false,"historicalAffected":[]},{"revision":"a8ccbf73f448471c806f3129d22cbf70","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6488","aliases":["CVE-2026-61709","GHSA-g3pg-frfm-pr2m"],"title":"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","description":"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","state":0,"publishedAt":"2026-09-28T16:43:40+00:00","modifiedAt":"2026-09-28T17:00:17.3517995+00:00","affected":[{"ecosystem":"Go","name":"github.com/openfga/openfga","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.18.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m","https://nvd.nist.gov/vuln/detail/CVE-2026-61709","https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9ac3","https://github.com/openfga/openfga/releases/tag/v1.18.1"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6488","license":"OSV · upstream source license applies","key":"osv:GO-2026-6488","identifiers":["GO-2026-6488","CVE-2026-61709","GHSA-g3pg-frfm-pr2m"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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