# CVE-2025-34511: Sitecore - Arbitrary File Upload

> Live exploitation tracking for CVE-2025-34511 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-34511

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 8.8
- **Public exploit available:** Yes
- **Affected products:** Sitecore Powershell Extension
- **Weaknesses:** CWE-434 (Unrestricted Upload of File with Dangerous Type)
- **Tags:** cms, windows, enterprise_software

## Description

Sitecore PowerShell Extensions, an add-on to Sitecore Experience Manager (XM) and Experience Platform (XP), through version 7.0 is vulnerable to an unrestricted file upload issue. A remote, authenticated attacker can upload arbitrary files to the server using crafted HTTP requests, resulting in remote code execution.

## CrowdSec analysis

[CVE-2025-34511](https://euvd.enisa.europa.eu/vulnerability/CVE-2025-34511) is a critical vulnerability in the Sitecore PowerShell Extensions plugin. It allows remote, unauthenticated attackers to upload arbitrary files to the server, potentially leading to remote code execution.

CrowdSec has been tracking this vulnerability and its exploits since 20th of June 2025.

CrowdSec network data shows that most actors exploiting CVE-2025-34511 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature.
CrowdSec data also reveals a clear uptick in attacks involving CVE-2025-34511 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.

Attackers exploit this vulnerability by sending crafted POST requests with malicious payloads to the `powershelluploadfile2.aspx` endpoint, located at `/sitecore%20modules/shell/powershell/uploadfile`.

## Timeline

- 2025-06-17: CVE Published. CVE-2025-34511 is published to NVD.
- 2025-06-20: Rule Released. CrowdSec releases a rule to detect CVE-2025-34511 exploitation attempts against the CrowdSec Network.
- 2025-09-20: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-34511 for the first time.

## References

- https://labs.watchtowr.com/is-b-for-backdoor-pre-auth-rce-chain-in-sitecore-experience-platform/

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-34511) follows observed exploitation activity for CVE-2025-34511. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.