CVE-2026-3563

Received Received - Intake

Improper Input Validation in PowerShell Universal Causes DoS

Publication date: 2026-03-17

Last updated on: 2026-03-19

Assigner: Devolutions Inc.

Description

Improper input validation in the apps and endpoints configuration in PowerShell Universal before 2026.1.4 allows an authenticated user with permissions to create or modify Apps or Endpoints to override existing application or system routes, resulting in unintended request routing and denial of service via a conflicting URL path.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-03-17

Last Modified

2026-03-19

Generated

2026-07-06

AI Q&A

2026-03-17

EPSS Evaluated

2026-07-05

NVD

CVE-2026-3563

EUVD

EUVD-2026-12636

Affected Vendors & Products

Vendor	Product	Version / Range
ironmansoftware	powershell_universal	to 2026.1.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1289	The product receives an input value that is used as a resource identifier or other type of reference, but it does not validate or incorrectly validates that the input is equivalent to a potentially-unsafe value.

Attack-Flow Graph

Impact Analysis

This vulnerability can impact you by allowing an authenticated user with certain permissions to disrupt normal service operation.

Specifically, the attacker can cause denial of service conditions by creating conflicting URL paths that interfere with intended request routing.

Compliance Impact

I don't know

Detection Guidance

I don't know

Executive Summary

CVE-2026-3563 is a medium-severity vulnerability in PowerShell Universal versions before 2026.1.4 caused by improper input validation in the apps and endpoints configuration.

An authenticated user who has permissions to create or modify Apps or Endpoints can exploit this flaw to override existing application or system URL routes.

This override results in unintended request routing conflicts and can lead to denial of service by creating conflicting URL paths.

Mitigation Strategies

The recommended immediate step to mitigate this vulnerability is to upgrade PowerShell Universal to version 2026.1.4 or later.

This update addresses the improper input validation issue that allows authenticated users to override existing application or system URL routes, preventing unintended request routing conflicts and denial of service.

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