CVE-2026-61398

CRITICAL CVSS 3.1: 9.1 EPSS 0.32%
Updated Aug 27, 2026
Apache
Parameter Value
CVSS 9.1 (CRITICAL)
Affected Versions 4.15.1.0 — 4.22.1.1
Fixed In 4.20.3.1
Type CWE-116 (Improper Encoding or Escaping of Output)
Vendor Apache
Public PoC No

Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Instance Reset Password functionality. This issue affects Apache CloudStack: from 4.15.1.0 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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Apache Cloudstack
cpe:2.3:a:apache:cloudstack:*:*:*:*:*:*:*:*
4.15.1.0 4.20.3.1
Apache Cloudstack
cpe:2.3:a:apache:cloudstack:*:*:*:*:*:*:*:*
4.21.0.0 4.22.1.1