Server-Side Request Forgery in Apache CloudStack Webhook Module
CVE-2026-59085

9.1CRITICAL

Key Information:

Vendor

Apache
Status
Apache Cloudstack
Vendor
CVE Published:
21 August 2026

What is CVE-2026-59085?

A Server-Side Request Forgery (SSRF) vulnerability exists in the webhook module of Apache CloudStack. This flaw allows attackers to send malicious requests through the server, which can lead to unauthorized access and potential data exposure. The vulnerability impacts versions of Apache CloudStack from 4.20.0.0 to 4.20.3.0 and from 4.21.0.0 to 4.22.1.0. To mitigate the risk, users are advised to upgrade to version 4.20.3.1 or 4.22.1.1 or later. Keeping your software up to date is crucial for maintaining a secure environment.

Affected Version(s)

Apache CloudStack 4.20.0.0 <= 4.20.3.0

Apache CloudStack 4.21.0.0 <= 4.22.1.0

References

https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3f...
vendor-advisory

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jonathan Leitschuh <jonathan.leitschuh@gmail.com>
Łukasz Bawolski <Lukasz.Bawolski@exea.pl>
George Chen (GitHub: geo-chen)
.