CVE-2026-47839 PUBLISHED

Federated OIDC Users Can Bypass externalGroupsWhitelist to Gain uaa.admin

Assigner: vmware
Reserved: 20.05.2026 Published: 11.09.2026 Updated: 11.09.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	High	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Cloud Foundry Foundation
Product	UAA
Versions	affected from 0 to 77.30.0 (incl.) Version 77.31.0 is unaffected

Vendor	Cloud Foundry Foundation
Product	cf-deployment
Versions	affected from 0 to 48.9.0 (incl.) Version 48.10.0 is unaffected

Credits

Tanzu at Broadcom (responsible disclosure) finder

References

https://www.cloudfoundry.org/blog/cve-2026-47839-federated-oidc-users-can-bypass-externalgroupswhitelist-to-gain-uaa-admin/