CVE-2025-55213Network attack vector

Authorization bypass via incorrect userset optimization

Published Aug 18, 2025 · Updated Aug 18, 2025

Incorrect authorization in OpenFGA 1.9.3 through 1.9.4 allows remote authenticated users to obtain unauthorized downstream access. The LocalChecker.checkDirect path applies the weight-two resolver when multiple directly assignable usersets share a type, relying on object ID equality without checking the relation. Exposure requires a model with more than one same-type directly assignable userset, assigned userset tuples, and dependent Check or ListObjects queries.

CVSS severity9.8
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in OpenFGA 1.9.3 through 1.9.4 allows remote authenticated users to obtain unauthorized downstream access. The LocalChecker.checkDirect path applies the weight-two resolver when multiple directly assignable usersets share a type, relying on object ID equality without checking the relation. Exposure requires a model with more than one same-type directly assignable userset, assigned userset tuples, and dependent Check or ListObjects queries.

The record

CVE
CVE-2025-55213
Published
Aug 18, 2025
Updated
Aug 18, 2025
Vendor
OpenFGA
Product
OpenFGA
Classifications
CWE-863
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.9.3, < 1.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenFGA · OpenFGAversion=>= 1.9.3, < 1.9.5

Published CVSS scores

5.8GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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