Federated OIDC Vulnerability in Cloud Foundry
CVE-2026-47839

9.2CRITICAL

Key Information:

Vendor

Cloud Foundry Foundation

Status
Uaa
Cf-deployment
Vendor
CVE Published:
11 September 2026

What is CVE-2026-47839?

A security flaw has been identified that allows users authenticating through a federated OpenID Connect (OIDC) provider to gain unauthorized access to the uaa.admin scope. This issue arises when the OIDC identity provider utilizes groupMappingMode: AS_SCOPES along with a wildcard entry in the externalGroupsWhitelist configuration. This vulnerability undermines the intended restrictions set by operators, potentially exposing sensitive administrative capabilities to unauthorized users.

Affected Version(s)

cf-deployment 0 <= 48.9.0

UAA 0 <= 77.30.0

cf-deployment 48.10.0

References

https://www.cloudfoundry.org/blog/cve-2026-47839-federate...

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tanzu at Broadcom (responsible disclosure)
.