CVE-2025-67288Public exploitNetwork attack vector

PDF JavaScript execution via unfiltered media upload

Published Dec 22, 2025 · Updated Dec 22, 2025

Arbitrary file upload in Umbraco CMS 16.3.3 allows remote attackers to store a crafted PDF that executes JavaScript when opened. The media upload path accepts PDF content without built-in server-side content filtering, leaving validation to an optional implementation hook. Umbraco disputes that this is a product vulnerability because PDF JavaScript remains isolated from the site DOM; execution requires a user to open the uploaded document.

CVSS severity10.0
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Umbraco CMS 16.3.3 allows remote attackers to store a crafted PDF that executes JavaScript when opened. The media upload path accepts PDF content without built-in server-side content filtering, leaving validation to an optional implementation hook. Umbraco disputes that this is a product vulnerability because PDF JavaScript remains isolated from the site DOM; execution requires a user to open the uploaded document.

The record

CVE
CVE-2025-67288
Published
Dec 22, 2025
Updated
Dec 22, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 22, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

10.0CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
5.8GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:P
10.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002Malicious File

Public exploit references

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

Technologies

Your stack

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Your stack

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