CVE-2026-55689— OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset
Quick assessment
Affected
openfga openfga
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
OpenFGA是OpenFGA团队开源的一款为开发人员构建并受 Google Zanzibar 启发的高性能和灵活的授权/许可引擎。 openFGA 1.18.0之前版本存在授权问题漏洞，该漏洞源于OIDC身份验证器在配置了authn.method为oidc且设置了authn.oidc.issuer但未设置authn.oidc.audience时，跳过了JWT受众验证，可能允许同一身份提供者为无关服务签发的令牌用于身份认证。
Possible ATT&CK Techniques 1 AI
T1199 · Trusted Relationship
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I. Basic Information for CVE-2026-55689
Vulnerability Information
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Vulnerability Title
OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset
Source: CVE Program / CVE List V5
Vulnerability Description
OpenFGA is an authorization/permission engine built for developers. Prior to 1.18.0, OpenFGA's OIDC authenticator skipped JWT audience validation when authn.method was set to oidc, authn.oidc.issuer was configured, and authn.oidc.audience was not set, allowing a token minted for an unrelated service by the same identity provider to authenticate to OpenFGA. This issue is fixed in 1.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
openfga 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenFGA是OpenFGA团队开源的一款为开发人员构建并受 Google Zanzibar 启发的高性能和灵活的授权/许可引擎。 openFGA 1.18.0之前版本存在授权问题漏洞，该漏洞源于OIDC身份验证器在配置了authn.method为oidc且设置了authn.oidc.issuer但未设置authn.oidc.audience时，跳过了JWT受众验证，可能允许同一身份提供者为无关服务签发的令牌用于身份认证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-55689
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Patches & Fixes for CVE-2026-55689 (1)
Vendor Advisories for CVE-2026-55689 (1)
Vendor Pages for CVE-2026-55689 (1)
Other References for CVE-2026-55689 (1)
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🔗 Page not found · GitHub · GitHub x_refsource_MISC
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V. Comments for CVE-2026-55689
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