Apache CloudStack up to 4.20.3.0/4.21.0.0/4.22.1.0 UI encoding error

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.32-

Summaryinfo

A vulnerability was found in Apache CloudStack up to 4.20.3.0/4.21.0.0/4.22.1.0. It has been classified as critical. Affected is an unknown function of the component UI. This manipulation causes encoding error. This vulnerability appears as CVE-2026-61399. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Apache CloudStack up to 4.20.3.0/4.21.0.0/4.22.1.0. It has been declared as critical. Affected by this vulnerability is an unknown code block of the component UI. The manipulation with an unknown input leads to a encoding error vulnerability. The CWE definition for the vulnerability is CWE-172. The product does not properly encode or decode the data, resulting in unexpected values. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Lock User Functionality. 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.

It is possible to read the advisory at lists.apache.org. This vulnerability is known as CVE-2026-61399 since 07/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/21/2026).

Upgrading to version 4.20.3.1 or 4.22.1.1 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Encoding error
CWE: CWE-172
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CloudStack 4.20.3.1/4.22.1.1

Timelineinfo

07/09/2026 CVE reserved
08/21/2026 +43 days Advisory disclosed
08/21/2026 +0 days VulDB entry created
08/21/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: lists.apache.org
Status: Confirmed

CVE: CVE-2026-61399 (🔒)
GCVE (CVE): GCVE-0-2026-61399
GCVE (VulDB): GCVE-100-394063

Entryinfo

Created: 08/21/2026 10:52
Changes: 08/21/2026 10:52 (55)
Complete: 🔍
Cache ID: 216::103

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