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Advisory record · GHSA-54mj-vcvj-q3v5

Umbraco CMS has an arbitrary file upload vulnerability

CVSS 10.0 CriticalCriticalEPSS 0.0055 · 46th percentile

Critical, because:

  • CVSS score 10.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 22 Dec 2025, 21:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
Umbraco.CmsNuGet<=16.3.3No fixed version yet
Identifiers
GHSA-54mj-vcvj-q3v5 · CVE-2025-67288
Weakness (CWE)
CWE-79 · CWE-434
Tags
Published
22 Dec 2025
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Umbraco.Cms versions up to and including 16.3.3 are affected by an arbitrary file upload vulnerability. The source says an attacker can upload a crafted PDF file to execute arbitrary code, because the product does not filter uploads by default and relies on users to add their own validation. The source does not give a fixed version, and the vendor disputes the report. Users can add server-side file validation hooks to restrict accepted uploads.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
10.0 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0055, the 46th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 22 Dec 2025, 19:15 UTC Confirmed by NVD
  2. 31 Oct 2026, 15:21 UTC First seen by agentprime
  3. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.