CVE-2025-32017Network attack vector

Authenticated file write via traversal filename

Published Apr 8, 2025 · Updated Apr 9, 2025

Path traversal in Umbraco CMS 14 and 15 allows remote authenticated users to upload files outside the intended temporary-file directory. TemporaryFileService accepted a client-supplied filename after checking only its extension, then passed that name to repository storage without filename validation. A backoffice account is required, and successful exploitation writes attacker-chosen content outside the intended temporary-file root.

CVSS severity8.8
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Umbraco CMS 14 and 15 allows remote authenticated users to upload files outside the intended temporary-file directory. TemporaryFileService accepted a client-supplied filename after checking only its extension, then passed that name to repository storage without filename validation. A backoffice account is required, and successful exploitation writes attacker-chosen content outside the intended temporary-file root.

The record

CVE
CVE-2025-32017
Published
Apr 8, 2025
Updated
Apr 9, 2025
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-23, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2025Record 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=>= 14.0.0--preview004, < 14.3.4
  2. Affected versionversion=>= 15.0.0-rc1, < 15.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Umbraco · Umbraco CMSversion=>= 14.0.0--preview004, < 14.3.4; version=>= 15.0.0-rc1, < 15.3.1

Published CVSS scores

8.8GitHub, Inc.CVSS: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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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