CVE-2026-59799Network attack vectorHinoki check available

Two-factor authentication bypass via missing privilege check

Published Aug 21, 2026 · Updated Aug 21, 2026

Authentication bypass in Apache CloudStack 4.18.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0 allows attackers to disable 2FA. The two-factor authentication plugin's disable flow omits the privilege check that should authorize removal of an account's second factor. Apache has not disclosed the request parameters or account state needed to reach the flow; successful exploitation removes the affected account's second-factor requirement.

CVSS severity9.8
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in Apache CloudStack 4.18.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0 allows attackers to disable 2FA. The two-factor authentication plugin's disable flow omits the privilege check that should authorize removal of an account's second factor. Apache has not disclosed the request parameters or account state needed to reach the flow; successful exploitation removes the affected account's second-factor requirement.

The record

CVE
CVE-2026-59799
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
The Apache Software Foundation
Product
Apache CloudStack
Classifications
CWE-269, T1556.006
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.18.0.0 <=4.20.3.0
  2. Affected versionversion=4.21.0.0 <=4.22.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Apache Software Foundation · Apache CloudStackversion=4.18.0.0 <=4.20.3.0; version=4.21.0.0 <=4.22.1.0

Published CVSS scores

7.5TenableAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1556.006Modify Authentication Process: Multi-Factor Authentication

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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