---
title: "CVE-2026-82432: Apache Nimbus - Broken Access Control"
description: "Apache Nimbus < 3.1.0 contains an authorization bypass caused by insufficient validation of topology.blobstore.map and lack of authorization in listBlobs, letting attackers with rebalance rights or network access disclose blob metadata and introduce unauthorized blobstore entries, exploit requires rebalance privileges or network access to Nimbus Thrift port."
url: https://panop.io/threat-heartbeat/CVE-2026-82432/
---

# CVE-2026-82432 Apache Nimbus - Broken Access Control

Apache Nimbus < 3.1.0 contains an authorization bypass caused by insufficient validation of topology.blobstore.map and lack of authorization in listBlobs, letting attackers with rebalance rights or network access disclose blob metadata and introduce unauthorized blobstore entries, exploit requires rebalance privileges or network access to Nimbus Thrift port.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.37% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-82432)

## Details

Type

Broken Access Control

Impact

Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-863](https://cwe.mitre.org/data/definitions/863.html)

## Vendor fix

Upgrade to version 3.1.0 or later.

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-2026-82432](https://nvd.nist.gov/vuln/detail/CVE-2026-82432)
- [https://lists.apache.org/thread/psy1gj77jhf9y3lhph9yz4f5fovmkz7b](https://lists.apache.org/thread/psy1gj77jhf9y3lhph9yz4f5fovmkz7b)
- [http://www.openwall.com/lists/oss-security/2026/09/13/12](http://www.openwall.com/lists/oss-security/2026/09/13/12)

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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

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