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CVE-2026-61398: CWE-116 Improper Encoding or Escaping of Output in Apache Software Foundation Apache CloudStack

0
Critical
VulnerabilityCVE-2026-61398cvecve-2026-61398cwe-116
Published: 08/21/2026 (08/21/2026, 08:25:47 UTC)
Source: CVE Database V5
Vendor/Project: Apache Software Foundation
Product: Apache CloudStack

Description

CVE-2026-61398 is a critical vulnerability in Apache CloudStack affecting versions from 4.15.1.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0. It involves improper encoding or escaping of output in the UI during the Instance Reset Password functionality. This flaw can lead to high impact on confidentiality and integrity. Fixed versions are 4.20.3.1 and 4.22.1.1 or later.

CVSS v3.1

Score 9.1critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected software

Apache Software Foundation

Apache CloudStack

Affected versions
>=4.15.1.0 <=4.20.3.0>=4.21.0.0 <=4.22.1.0
Mavenmore threats →ai
org.apache.cloudstack/cloudstack
pkg:maven/org.apache.cloudstack/cloudstack
Affected versions
=4.15.1.0>=4.15.1.0 <4.20.3.1=4.21.0.0>=4.21.0.0 <4.22.1.1

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/10/2026, 18:30:44 UTC

Technical Analysis

This vulnerability (CWE-116) in Apache CloudStack's user interface occurs when output is not properly encoded or escaped during the Instance Reset Password feature. This improper handling can allow an attacker to inject malicious content, potentially compromising confidentiality and integrity of the system. The issue affects Apache CloudStack versions 4.15.1.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0. The Apache Software Foundation has released fixed versions 4.20.3.1 and 4.22.1.1 to address this vulnerability.

Potential Impact

The vulnerability has a CVSS 3.1 base score of 9.1 (critical), indicating it can be exploited remotely without privileges or user interaction, leading to complete compromise of confidentiality and integrity. Availability impact is not affected. There are no known exploits in the wild at this time.

Mitigation Recommendations

Users should upgrade Apache CloudStack to version 4.20.3.1 or 4.22.1.1 or later, where this vulnerability has been fixed. No other mitigation or temporary workaround is indicated.

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Technical Details

Data Version
5.2
Assigner Short Name
apache
Date Reserved
2026-07-09T08:07:00.350Z
State
PUBLISHED

Threat ID: 6a88309eacd9273b4907b86d

Added to database: 08/21/2026, 11:03:58 UTC

Last enriched: 09/10/2026, 18:30:44 UTC

Last updated: 10/05/2026, 06:48:17 UTC

Views: 61

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