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CVE-2026-47839— Federated OIDC Users Can Bypass externalGroupsWhitelist to Gain uaa.admin

Quick assessment

Affected
Cloud Foundry Foundation UAA
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.

Cloud Foundry UAA是美国Cloud Foundry基金会的一款身份认证与授权管理平台。 Cloud Foundry UAA存在权限许可和访问控制问题漏洞，该漏洞源于OIDC身份提供者使用groupMappingMode: AS_SCOPES和通配符externalGroupsWhitelist条目时，访问控制不当，可能导致通过联合OIDC提供者认证的用户绕过externalGroupsWhitelist限制并获取uaa.admin权限。

CVSS 9.2 · Critical EPSS 0.30% · P23

Affected Version Matrix 4

VendorProduct Version RangeStatus
Cloud Foundry Foundation cf-deployment ≤ 48.9.0 affected
48.10.0 unaffected
Cloud Foundry Foundation UAA ≤ 77.30.0 affected
77.31.0 unaffected
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I. Basic Information for CVE-2026-47839

Vulnerability Information
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Vulnerability Title
Federated OIDC Users Can Bypass externalGroupsWhitelist to Gain uaa.admin
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability allows users authenticating through a federated OIDC provider to obtain the uaa.admin scope despite operators restricting that provider through externalGroupsWhitelist configuration. The issue occurs specifically when an OIDC identity provider uses groupMappingMode: AS_SCOPES with a wildcard externalGroupsWhitelist entry.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Cloud Foundry UAA 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloud Foundry UAA是美国Cloud Foundry基金会的一款身份认证与授权管理平台。 Cloud Foundry UAA存在权限许可和访问控制问题漏洞，该漏洞源于OIDC身份提供者使用groupMappingMode: AS_SCOPES和通配符externalGroupsWhitelist条目时，访问控制不当，可能导致通过联合OIDC提供者认证的用户绕过externalGroupsWhitelist限制并获取uaa.admin权限。
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

Vendor Product Affected Versions CPE Subscribe
Cloud Foundry Foundation UAA 0 ~ 77.30.0 -
Cloud Foundry Foundation cf-deployment 0 ~ 48.9.0 -

II. Public POCs for CVE-2026-47839

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III. Intelligence Information for CVE-2026-47839

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Security Blog Posts for CVE-2026-47839 (1)

IV. Related Vulnerabilities

Same product: UAA
Same vendor: Cloud Foundry Foundation

V. Comments for CVE-2026-47839

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