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 ↗

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

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

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