CVE-2026-61709
Description
A flaw was found in OpenFGA, an authorization and permission engine. The ListUsers application programming interface (API) could incorrectly return users who should have been excluded from authorization decisions. This vulnerability arises when complex authorization rules, involving both exclusions and type-bound wildcards, are processed. Consequently, applications relying on ListUsers for access control might inadvertently grant unauthorized access to resources or sensitive information.
Statement
This flaw is in OpenFGA's ListUsers API, which could return a user who should have been excluded by a but-not clause when an intersection used a type-bound public wildcard. Red Hat does not ship OpenFGA as a standalone product. The code is bundled in Grafana's experimental Zanzana authorization engine and Grafana is embedded in Red Hat Ceph Storage dashboards, Red Hat Advanced Cluster Management, Multicluster Global Hub, and the RHEL grafana package. Zanzana is disabled by default in upstream Grafana. Grafana's own authorization path uses Check and ListObjects, not ListUsers, so the vulnerable API is not the enforcement path in these products.
Mitigation
No product-side mitigation is required while Zanzana remains disabled, which is the default. If Zanzana has been turned on, do not use ListUsers results as an access-control decision; use Check for each user and object until Grafana vendors OpenFGA 1.18.1 or later.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | 5.3 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability
Technical Impact: Varies by Context; Unexpected State
The consequences will vary based on the context surrounding the incorrect precedence. In a security decision, integrity or confidentiality are the most likely results. Otherwise, a crash may occur due to the software reaching an unexpected state.
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