Unrestricted File Upload Vulnerability in Sitecore PowerShell Extensions by Sitecore
CVE-2025-34511

8.8HIGH

Key Information:

Vendor

Sitecore

Status
Powershell Extension
Vendor
CVE Published:
17 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-34511?

The Sitecore PowerShell Extensions, an add-on for Sitecore Experience Manager and Experience Platform, is susceptible to an unrestricted file upload vulnerability. This flaw allows remote, authenticated attackers to upload arbitrary files to the server through specially crafted HTTP requests, potentially leading to remote code execution. Organizations utilizing this extension should evaluate their security posture and implement the necessary patches.

Affected Version(s)

Powershell Extension 0 <= 7.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-34511 - Proof of Concept

References

https://labs.watchtowr.com/is-b-for-backdoor-pre-auth-rce...
third-party-advisoryexploittechnical-description

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Piotr Bazydlo of watchTowr
.
CVE-2025-34511 : Unrestricted File Upload Vulnerability in Sitecore PowerShell Extensions by Sitecore