CVE-2026-3563
Improper Input Validation in PowerShell Universal Causes DoS
Publication date: 2026-03-17
Last updated on: 2026-03-19
Assigner: Devolutions Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| ironmansoftware | powershell_universal | to 2026.1.4 (exc) |
Helpful Resources
Exploitability
| 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
AI Powered Q&A
Can you explain this vulnerability to me?
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.
What immediate steps should I take to mitigate this vulnerability?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know