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GHSA-g3pg-frfm-pr2m

MediumCVSS 5.3 / 10
Published Sep 16, 2026·Last modified Sep 16, 2026
Affected Components(1)
Go logogithub.com/openfga/openfga
< 1.18.1
Description

Description

In OpenFGA, the ListUsers API could incorrectly return a user who should have been excluded.

Preconditions

This applies if all of the following are present:

  • The authorization model contains a relation defined as an intersection (and) where at least one operand is an exclusion of the form base but not excluded: e.g. rel1: (public_user but not blocked) and rel2
  • The base side of that exclusion is granted through a type-bound public wildcard (e.g. user:*).
  • A user excluded by the but not clause is also granted, via a concrete tuple, through another operand of the intersection.
  • Your application uses ListUsers to enumerate or enforce access

Fix

Upgrade to OpenFGA v1.18.1 or greater.

Acknowledgements

OpenFGA would like to thank @5ud0er for the detailed report.

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Risk Scores
Base Score
5.3

The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.35%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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