CVE-2026-61400
Authenticated admin API command injection allows root on CloudStack system VMs/virtual routers.
Is CVE-2026-61400 being exploited?
Not confirmed. CVE-2026-61400 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 1.5% probability of exploitation in the next 30 days.
How severe is CVE-2026-61400?
CVE-2026-61400 is rated High with a CVSS score of 8.8. 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-2026-61400?
Yes. A fix has been recorded for CVE-2026-61400. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-61400 affect?
CVE-2026-61400 affects Apache CloudStack 4.20.0.0 - 4.20.3.0, Apache CloudStack 4.21.0.0 - 4.22.1.0, System VMs, Virtual Routers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-61400?
Upgrade to 4.20.3.1 or 4.22.1.1+; restrict and audit Admin API access; rotate admin credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated admin can execute arbitrary commands as root on system VMs/virtual routers, enabling full instance compromise, lateral movement, and visibility of guest traffic.
Immediate action required
- affected>= 4.14.0.0 and <= 4.20.3.0
- affected>= 4.21.0.0 and <= 4.22.1.0
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.