---
title: "CVE-2026-82431: Apache Storm - Broken Access Control"
description: "Apache Storm < 3.1.0 contains a broken access control caused by improper evaluation of nimbus.groups when nimbus.users is empty in SimpleACLAuthorizer, letting authenticated operators bypass group restrictions and perform all user-level operations, exploit requires cluster access with authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-82431/
---

# CVE-2026-82431 Apache Storm - Broken Access Control

Apache Storm < 3.1.0 contains a broken access control caused by improper evaluation of nimbus.groups when nimbus.users is empty in SimpleACLAuthorizer, letting authenticated operators bypass group restrictions and perform all user-level operations, exploit requires cluster access with authentication.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.39% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-82431)

## Details

Type

Broken Access Control

Impact

Broken Access Control

CVSS vector

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

Published

14 September 2026

Updated

15 October 2026

Weakness

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

## Vendor fix

Upgrade to Apache Storm 3.1.0 or later where nimbus.groups is properly evaluated regardless of nimbus.users setting.

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-2026-82431](https://nvd.nist.gov/vuln/detail/CVE-2026-82431)
- [https://lists.apache.org/thread/s335qxb6woqb35ho3fpq7toytsz1gpts](https://lists.apache.org/thread/s335qxb6woqb35ho3fpq7toytsz1gpts)
- [http://www.openwall.com/lists/oss-security/2026/09/13/11](http://www.openwall.com/lists/oss-security/2026/09/13/11)

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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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