by Kastro
Paper/Archive/CVE-2026-47839

CVE-2026-47839

Cloud Foundry Foundation UAA — Federated OIDC Users Can Bypass externalGroupsWhitelist to Gain uaa.admin

EPSS 0.3%CVSS 9.2
critical.is priorityof 100
33
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 24.3.243 × 204.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
UAA≤ 77.30.077.31.0CNA
cf-deployment≤ 48.9.048.10.0CNA

Scores by source

vmware (CNA)9.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refcloudfoundry.org/blog/cve-2026-47839-federated-oidc-users-can-bypass-externalgroupswhitelist-to-gain-uaa-admin