OpenFGA up to 1.17.x Authorization Engine improper authorization

Summaryinfo

A vulnerability classified as problematic has been found in OpenFGA up to 1.17.x. Impacted is an unknown function of the component Authorization Engine. The manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-55170. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OpenFGA up to 1.17.x. This issue affects some unknown processing of the component Authorization Engine. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality. The summary by CVE is:

OpenFGA is an authorization/permission engine built for developers. Prior to 1.18.0, when MySQL is being used as the datastore and authorization decisions rely on case-sensitive user strings, the tuple, changelog, and authorization_model identifier columns can compare case-distinct values such as user:Alice and user:alice as equivalent, causing two distinct check requests to return the same response. This issue is fixed in 1.18.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-55170 since 06/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 1.18.0 eliminates this vulnerability.

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Productinfo

Name

• OpenFGA

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17

Website

• Product: https://github.com/openfga/openfga/

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