CVE-2025-34511Known exploitationPublic exploitNetwork attack vector

Authenticated RCE via unchecked upload path

Published Jun 17, 2025 · Updated Feb 26, 2026

Unrestricted file upload in Sitecore PowerShell Extensions 7.0 and earlier allows remote authenticated users to execute arbitrary code. PowerShellUploadFile2.aspx passes the attacker-controlled ItemUri as uploadArgs.Folder and leaves AllowedFileTypes unset, permitting any filename and extension. A valid Sitecore session is required; a crafted multipart request can place an ASPX web shell wherever the IIS identity can write, enabling server compromise.

CVSS severity8.7
High
EPSS probability22.32%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Sitecore PowerShell Extensions 7.0 and earlier allows remote authenticated users to execute arbitrary code. PowerShellUploadFile2.aspx passes the attacker-controlled ItemUri as uploadArgs.Folder and leaves AllowedFileTypes unset, permitting any filename and extension. A valid Sitecore session is required; a crafted multipart request can place an ASPX web shell wherever the IIS identity can write, enabling server compromise.

The record

CVE
CVE-2025-34511
Published
Jun 17, 2025
Updated
Feb 26, 2026
Vendor
Sitecore
Product
Sitecore PowerShell Extensions
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sitecore · Sitecore PowerShell Extensionsversion=0 <=7.0

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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