CVE-2026-61422: Apache CloudStack SSRF in template and ISO registration

CVE-2026-61422 · Severity: medium · CVSS 4.3 · Published 2026-08-21

Apache CloudStack is a cloud management platform that allows administrators to register virtual machine templates and ISO images for deployment. The vulnerability permits an authenticated attacker to trigger HTTP requests to arbitrary URLs before CloudStack validates the destination, potentially probing internal networks or services. Although URL validation does occur before actual file download, the pre-validation HTTP call creates a window for reconnaissance or denial-of-service attacks against the management server.

Technologies: Apache Cloudstack. Vendors: Apache.

Quick answers

Is CVE-2026-61422 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-61422 being exploited in the wild.
How severe is CVE-2026-61422?
Medium severity, with a CVSS score of 4.3, published 21 August 2026.
Which products and versions are affected?
Apache Cloudstack 4.20.3.0 and 4.21.0.0 through 4.22.1.0.
Is there a fix for CVE-2026-61422?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-61422 attacked?
It is attacked over the network.
Am I affected by CVE-2026-61422?
Check whether you run Apache Cloudstack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is a Server-Side Request Forgery (SSRF) vulnerability in CloudStack's template and ISO registration workflow. When an authenticated user registers a template or ISO file, CloudStack performs a live HTTP HEAD/GET request to the specified URL to determine file size for secondary storage quota checks—but this request happens before URL validation is applied. An attacker with valid credentials can supply a malicious URL pointing to internal services, private IP ranges, or localhost, causing the CloudStack management server to make unsolicited requests and potentially leak response headers or service information. Although URL validation occurs later before the Secondary Storage VM performs the actual download, the pre-validation HTTP call remains exploitable for network reconnaissance. Patches are available in versions 4.20.3.1, 4.22.1.1, and later.

Affected products

  • Apache CloudStack 4.20.3.0 and 4.21.0.0 through 4.22.1.0

Timeline

  • 2026-08-21: disclosed

References

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