CVE-2026-61709 Details
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.
A vulnerability exists in OpenFGA versions prior to 1.18.1 within the ListUsers API. The issue arises when an authorization relation uses an intersection that includes a base operand granted through a type-bound public wildcard, while also incorporating an excluded operand with a concrete tuple from another intersection. In such cases, the API may incorrectly return a user that should have been excluded. This flaw allows applications that rely on ListUsers for access enumeration or enforcement to mistakenly treat the excluded user as authorized.
Users can upgrade to OpenFGA version 1.18.1 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 16, 2026CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9ac3 | [email protected] | Source CodeVendor |
| https://github.com/openfga/openfga/releases/tag/v1.18.1 | [email protected] | Release NotesVendor |
| https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-281 | Improper Preservation of Permissions | [email protected] |
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| OpenFGA | <= 1.18.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 18, 2026 | CVE Modified | CISA-ADP |
| Sep 16, 2026 | New CVE Received | [email protected] |