CVE-2026-40293Network attack vector

API key disclosure via unauthenticated playground response

Published Apr 17, 2026 · Updated Apr 17, 2026

Information disclosure in OpenFGA 0.1.4 through 1.13.1 allows remote attackers to obtain a preshared API key via the playground. The unauthenticated /playground handler embeds the configured key in its HTML response instead of keeping the credential server-side. Exposure requires preshared-key authentication, an enabled playground, and endpoint access beyond localhost or trusted networks; the disclosed key grants authenticated API access.

CVSS severity6.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in OpenFGA 0.1.4 through 1.13.1 allows remote attackers to obtain a preshared API key via the playground. The unauthenticated /playground handler embeds the configured key in its HTML response instead of keeping the credential server-side. Exposure requires preshared-key authentication, an enabled playground, and endpoint access beyond localhost or trusted networks; the disclosed key grants authenticated API access.

The record

CVE
CVE-2026-40293
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
OpenFGA
Product
OpenFGA
Classifications
CWE-200, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record 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=>= 0.1.4, < 1.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenFGA · OpenFGAversion=>= 0.1.4, < 1.14.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1528Steal Application Access Token

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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