---
title: "CVE-2026-59387: Cloud Controller - Authentication Bypass"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-59387/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-59387)

## 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](https://cwe.mitre.org/data/definitions/284.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-59387](https://nvd.nist.gov/vuln/detail/CVE-2026-59387)
- [https://www.cloudfoundry.org/blog/cve-2026-59387-broken-access-control-restriction-in-cloud-controller-api/](https://www.cloudfoundry.org/blog/cve-2026-59387-broken-access-control-restriction-in-cloud-controller-api/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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