EUVD-2026-63845
GHSA-5c78-m4xc-xx66
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Webhook configuration requires an authenticated account so PR:L not PR:N; SSRF primarily exposes internal data (C:H) with limited request-forging integrity impact (I:L) and no availability effect.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
4DescriptionCVE.org
Server-Side Request Forgery (SSRF) vulnerability in Apache CloudStack's webhook module, exploitable via webhook delivery requests.
This issue affects Apache CloudStack: from 4.20.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.
Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.
AnalysisAI
Server-Side Request Forgery in Apache CloudStack's webhook module lets attackers coerce the management server into issuing arbitrary HTTP requests via webhook delivery, reaching internal-only services and cloud metadata endpoints that are otherwise unreachable from outside. It affects Apache CloudStack 4.20.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0, carries a CVSS 9.1 (high confidentiality and integrity impact), and has no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target CloudStack deployment to have the webhook module in use and reachable, and the attacker must be able to influence a webhook delivery request/target URL. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals conflict on real-world urgency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Apache CloudStack 4.20.3.1 (for the 4.20.x branch) or 4.22.1.1 (for the 4.21.x/4.22.x branch) or later, per the Apache advisory at https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all systems running affected CloudStack versions (4.20.0-4.20.3 and 4.21.0-4.22.1); immediately implement firewall egress rules blocking the management server from reaching internal services and cloud metadata endpoints. …
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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