EUVD-2026-63841
GHSA-vw73-w3p2-w2rj
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-accessible API requires low-privileged authentication; 2FA bypass directly impacts confidentiality and integrity but availability impact is indirect and not inherent to the flaw itself.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
Improper Privilege Management vulnerability in Apache CloudStack's Two-factor authentication plugin allowing bypass of the two-factor authentication disable flow.
This issue affects Apache CloudStack: from 4.18.0.0 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.
Articles & Coverage 1
AnalysisAI
Two-factor authentication bypass in Apache CloudStack allows an authenticated low-privileged user to exploit an improper privilege management flaw in the 2FA plugin's disable flow, effectively circumventing the second authentication factor. Affected deployments span versions 4.18.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0, with vendor-confirmed fixes in 4.20.3.1 and 4.22.1.1. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, authenticated CloudStack user account with at minimum low-level privileges (confirmed by CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a network-reachable, low-complexity exploit requiring only low-privileged authentication - a realistic threat model for a multi-tenant cloud management platform where many users may hold standard user accounts. … 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 | Upgrade to Apache CloudStack version 4.20.3.1 (for deployments on the 4.18-4.20 branch) or 4.22.1.1 (for deployments on the 4.21-4.22 branch), as confirmed by 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: identify all CloudStack instances running affected versions (4.18.0.0-4.20.3.0 and 4.21.0.0-4.22.1.0) and assess exposure scope. …
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External POC / Exploit Code
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