CVE-2025-48953

5.5 MEDIUM 0.2% exploit odds Fix listed Code execution Web app

What it is

Umbraco is an ASP.NET content management system (CMS). Starting in version 14.0.0 and prior to versions 15.4.2 and 16.0.0, it's possible to upload a file that doesn't adhere with the configured allowable file extensions via a manipulated API request. The issue is patched in versions 15.4.2 and 16.0.0. No known workarounds are available.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account, but needs a user to act. Limited direct impact.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2025-06-03 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 09:30 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.2% in the next 30 days (EPSS).
Severity: 5.5 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2025-06-03 19:15 UTC
Last modified: 2026-06-17 09:30 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-434 · Unrestricted file upload
Record status: Analyzed

Affected

Umbraco Cms < 15.4.2

Attack profile CVSS 3.1 · 5.5

Attack vector: Network
Complexity: High
Privileges needed: Low
User interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: Low

Raw vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2025-48953.md and follow it. Check whether this project is affected by CVE-2025-48953. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record