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Fencer Vulns
medium 5.3

CVE-2026-61709 json

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

published 2026-09-16 53 d ago modified 2026-09-28 41 d ago also GHSA-g3pg-frfm-pr2m , GO-2026-6488 , EUVD-2026-80777

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/openfga/openfga 1.18.1
  • grafana13.1 hummingbird 1 13.1.6-0.4.hum1
  • grafana13.1 hummingbird 1 13.1.6-0.3.hum1
  • grafana12.4 hummingbird 1 12.4.10-0.6.hum1
  • grafana12.4 hummingbird 1 12.4.10-0.5.hum1
  • grafana13.2 hummingbird 1 13.2.1-0.4.hum1

red hat advisories RHSA-2026:72498RHSA-2026:71040RHSA-2026:68821RHSA-2026:68777RHSA-2026:67605

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-61709 updated cvss 5.3

github.com/openfga/openfga: OpenFGA: Unauthorized access due to ListUsers API returning deliberately excluded users.

  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 6 rhceph/rhceph-6-dashboard-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Ceph Storage 9 rhceph/grafana-rhel10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images grafana13.1 13.1.6-0.3.hum1, grafana13.1 13.1.6-0.4.hum1, grafana13.2 13.2.1-0.4.hum1, grafana12.4 12.4.10-0.5.hum1, grafana12.4 12.4.10-0.6.hum1
    fixed: vendor fix RHSA-2026:68777

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
51 d ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/openfga/openfga
<1.18.1
1.18.1

Affected products

  • openfga openfga

Classification

Weakness
  • CWE-281 Improper Preservation of Permissions
  • CWE-863 Incorrect Authorization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.