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Advisory record · GHSA-g3pg-frfm-pr2m

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

CVSS 5.3 MediumEPSS 0.0035 · 28th percentile

Published by the GitHub Advisory Database at 16 Sept 2026, 22:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/openfga/openfgaGo<1.18.11.18.1
Identifiers
GHSA-g3pg-frfm-pr2m · CVE-2026-61709 · GO-2026-6488
Weakness (CWE)
CWE-281 · CWE-863
Tags
Published
16 Sept 2026
Updated
28 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

OpenFGA versions below 1.18.1 can have the ListUsers API return a user who should have been excluded. This affects models where an intersection includes an exclusion whose base side is granted through a type-bound public wildcard, and the excluded user also holds a concrete grant through another operand of the intersection. The source does not say what an attacker must control to trigger it. Upgrade to OpenFGA 1.18.1 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.