Allows admin privilege escalation in Cloud Foundry UAA (widely used in cloud/Tanzu deployments); high CVSS and can lead to full tenant compromise.
CVE-2026-47839
Federated OIDC users can bypass whitelist to gain uaa.admin rights
Is CVE-2026-47839 being exploited?
Not confirmed. CVE-2026-47839 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-47839?
CVE-2026-47839 is rated Critical with a CVSS score of 9.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-47839?
Not known from our data. No patch reference has been recorded for CVE-2026-47839, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-47839 affect?
CVE-2026-47839 affects Cloud Foundry UAA, VMware Tanzu UAA deployments, Any UAA with OIDC groupMappingMode=AS_SCOPES and '*' externalGroupsWhitelist. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47839?
Remove wildcard externalGroupsWhitelist, restrict provider or disable AS_SCOPES; rotate tokens and apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated federated OIDC users can obtain uaa.admin scope, enabling full admin actions (create/manage users, tokens, config, takeover).
Immediate action required
- affected<= 48.9.0
- affected<= 77.30.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.