CVE-2026-47830
Authenticated users can overwrite BOSH Windows service binaries to gain SYSTEM.
Is CVE-2026-47830 being exploited?
Not confirmed. CVE-2026-47830 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-47830?
CVE-2026-47830 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-47830?
Yes. A fix has been recorded for CVE-2026-47830. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-47830 affect?
CVE-2026-47830 affects bosh-windows-stemcell-builder (< v2019.98), Windows VMs provisioned via BOSH (C:\bosh services). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47830?
Upgrade to v2019.98 and correct C:\bosh file permissions immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Low-privileged authenticated users can overwrite C:\bosh\service_wrapper.exe or C:\bosh\bosh-agent.exe and obtain NT AUTHORITY\SYSTEM after reboot, enabling full host takeover.
Immediate action required
- affected< 2019.98
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.