CVE-2026-59358 Cloud Foundry UAA - Authentication Bypass

Cloud Foundry UAA contains an authentication bypass caused by improper verification of Bearer credentials in the OAuth token endpoint, letting remote authenticated attackers obtain fully-privileged client_credentials tokens, exploit requires attacker to have a valid user access token for a client supporting both public authorization and client_credentials grant.

CVSS base score 7.6 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
EPSS
0.35% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
6 October 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Update to the latest version with fixed OAuth token endpoint authentication checks.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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