---
title: "CVE-2026-120307: Beta9 Worker - Broken Access Control"
description: "Beta9 worker before 0.1.756 contains a broken access control vulnerability caused by improper path resolution in sandbox file API, letting tenants with workspace tokens read, write, list, and delete files on the host as root, exploit requires tenant to have a workspace token and running sandbox."
url: https://panop.io/threat-heartbeat/CVE-2026-120307/
---

# CVE-2026-120307 Beta9 Worker - Broken Access Control

Beta9 worker before 0.1.756 contains a broken access control vulnerability caused by improper path resolution in sandbox file API, letting tenants with workspace tokens read, write, list, and delete files on the host as root, exploit requires tenant to have a workspace token and running sandbox.

CVSS base score 9.9 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.48% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-120307)

## Details

Type

Broken Access Control

Impact

File System Read, File System Write, Privilege Escalation

CVSS vector

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

Published

1 November 2026

Updated

3 November 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to worker version 0.1.756 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-2026-120307](https://nvd.nist.gov/vuln/detail/CVE-2026-120307)
- [https://github.com/beam-cloud/beta9/commit/a28bf12cf0007c792a25d8ed282b4e8bf6f30393](https://github.com/beam-cloud/beta9/commit/a28bf12cf0007c792a25d8ed282b4e8bf6f30393)
- [https://github.com/beam-cloud/beta9/pull/1897](https://github.com/beam-cloud/beta9/pull/1897)
- [https://github.com/beam-cloud/beta9/releases/tag/worker-0.1.756](https://github.com/beam-cloud/beta9/releases/tag/worker-0.1.756)
- [https://github.com/beam-cloud/beta9](https://github.com/beam-cloud/beta9)

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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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