CVE-2026-47839 Federated OIDC Users Can Bypass externalGroupsWhitelist to Gain uaa.admin
Federated OIDC users can bypass group whitelists to gain admin privileges when specific mapping modes are used.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-47839?
CVE-2026-47839 is a critical authentication bypass vulnerability in Cloud Foundry Foundation UAA, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2026-47839?
How do I fix CVE-2026-47839?
No fix has been published for CVE-2026-47839 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-47839 being exploited?
There is no known exploitation of CVE-2026-47839 in the wild and no public exploit code.
Sources
Also known as GHSA-9wp3-mffv-5vr4.