Vulnerability 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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/openfga/openfga/commit/171806c93b86bca29e0212ceb8b6ee9c48eb9a
- https://github.com/openfga/openfga/releases/tag/v1.18.1
- https://github.com/openfga/openfga/security/advisories/GHSA-g3pg-frfm-pr2m
FAQ
What is CVE-2026-61709?
CVE-2026-61709 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 int...
How severe is CVE-2026-61709?
CVE-2026-61709 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-61709?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.