CVE-2026-47830: Incorrect Permission Assignment Allows Local Privilege Escalation to SYSTEM via Executable Overwrite

Severity: high (CVSS 8.5 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-09 · updated 2026-10-25

Description

Incorrect Permission Assignment in BOSH.Utils.psm1 in BOSH-Ecosystem bosh-windows-stemcell-builder allows low-privilege authenticated users to overwrite C:\bosh\service_wrapper.exe or C:\bosh\bosh-agent.exe and gain NT AUTHORITY\SYSTEM on the next service restart or reboot. This can lead to full host control. Affected versions: bosh-windows-stemcell-builder versions prior to v2019.98.

Affected products

Cloud Foundry Foundation bosh-windows-stemcell-builder: before 2019.98 — fixed in 2019.98

How to fix

Upgrade to a fixed version: Cloud Foundry Foundation bosh-windows-stemcell-builder 2019.98. Check the vendor advisory for mitigations.

References

https://www.cloudfoundry.org/blog/cve-2026-47830-incorrect-permission-assignment-allows-local-privilege-escalation-to-system-via-executable-overwrite/

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