What is CVE-2026-25199?

CVE-2026-25199 is a critical-severity vulnerability in Apache Cloudstack, classified under Information Disclosure. CVSS score: 9.1/10. Published 2026-05-08.

How severe is CVE-2026-25199?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Information disclosure in Apache Cloudstack

CVE-2026-25199

Instances deployed via the Proxmox extension allow unauthorized access to instances belonging to other tenants. This issue affects Apache CloudStack: from 4.21.0.0 through 4.22.0.0. The Proxmox extension for CloudStack improperly u…

Vulnerability class: Information Disclosure

EPSS: 0.000 (10.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Apache Cloudstack
Apache Software Foundation Cloudstack — versions 4.21.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-25199?: CVE-2026-25199 is a critical-severity vulnerability in Apache Cloudstack, classified under Information Disclosure. CVSS score: 9.1/10. Published 2026-05-08.
How severe is CVE-2026-25199?: Critical severity. CVSS v3 base score is 9.1 out of 10.