← Vulnerability feed

Vulnerability record · CVE-2026-25199 · published 8 May 2026

CVE-2026-25199: Apache cloudstack information exposure vulnerability

Apache · Cloudstack

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 uses a user-editable instance setting, proxmox_vmid, to associate CloudStack instances with Proxmox virtual machines. Because this value is not restricted or validated against tenant ownership and Proxmox VM IDs are predictable, a non-privileged attacker can modify the setting to reference a VM belonging to another account. This allows unauthorized cross-tenant access and enables full control over the targeted VM, including starting, stopping, and destroying the virtual machine. Users are recommended to upgrade to version 4.22.0.1, which fixes this issue. As a workaround for the existing installations, editing of the proxmox_vmid instance detail by users can be prevented by adding this detail name to the global configuration parameter - user.vm.denied.details.

9.1 CVSS 3.1 Critical EPSS 0.50% · top 59.6% CWE-200 · Information exposure
9.1CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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 uses a user-editable instance setting, proxmox_vmid, to associate CloudStack instances with Proxmox virtual machines. Because this value is not restricted or validated against tenant ownership and Proxmox VM IDs are predictable, a non-privileged attacker can modify the setting to reference a VM belonging to another account. This allows unauthorized cross-tenant access and enables full control over the targeted VM, including starting, stopping, and destroying the virtual machine. Users are recommended to upgrade to version 4.22.0.1, which fixes this issue. As a workaround for the existing installations, editing of the proxmox_vmid instance detail by users can be prevented by adding this detail name to the global configuration parameter - user.vm.denied.details.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/09/7

Track CVE-2026-25199 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2012-4501Apache cloudstack permissions and access controls vulnerabilityCitrix Cloud.com CloudStack, and Apache CloudStack pre-release, allows remote attackers to make arbitrary API calls by leveraging the system user acc…EPSS 7.8%9.9CVE-2024-50386Apache cloudstack improper input validation vulnerabilityAccount users in Apache CloudStack by default are allowed to register templates to be downloaded directly to the primary storage for deploying instan…EPSS 1.5%9.8CVE-2024-39864Apache cloudstack code injection vulnerabilityThe CloudStack integration API service allows running its unauthenticated API server (usually on port 8096 when configured and enabled via integratio…EPSS 1.8%9.8CVE-2024-38346Apache cloudstack code injection vulnerabilityThe CloudStack cluster service runs on unauthenticated port (default 9090) that can be misused to run arbitrary commands on targeted hypervisors and …EPSS 3.3%9.8CVE-2024-29006Apache cloudstack authentication bypass by spoofing vulnerabilityBy default the CloudStack management server honours the x-forwarded-for HTTP header and logs it as the source IP of an API request. This could lead t…EPSS 0.87%9.8CVE-2022-35741Apache cloudstack xml external entity (xxe) vulnerabilityApache CloudStack version 4.5.0 and later has a SAML 2.0 authentication Service Provider plugin which is found to be vulnerable to XML external entit…EPSS 8.1%9.8CVE-2019-17562Apache cloudstack memory buffer overflow vulnerabilityA buffer overflow vulnerability has been found in the baremetal component of Apache CloudStack. This applies to all versions prior to 4.13.1. The vul…EPSS 2.9%9.8CVE-2016-6813Apache cloudstack vulnerabilityApache CloudStack 4.1 to 4.8.1.0 and 4.9.0.0 contain an API call designed to allow a user to register for the developer API. If a malicious user is a…EPSS 5.6%

Source: NIST National Vulnerability Database (record CVE-2026-25199), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.