CVE-2026-59387 Cloud Controller - Authentication Bypass

Cloud Controller contains an authentication bypass caused by missing deny rule for /internal/v3/ endpoints in Nginx routing, letting attackers with a valid build or droplet GUID submit forged staging callbacks and escalate privileges, exploit requires valid build or droplet GUID.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.23% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
30 October 2026
Updated
1 November 2026
Weakness
CWE-284

Vendor fix

Add deny rules for /internal/v3/ endpoints to Nginx routing configuration or update to a fixed version.

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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