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Vulnerabilities

Security fix · CVE-2025-48953

Umbraco is an ASP.NET content management system (CMS).

Published Jun 3, 2025 · catalog updated Jun 3, 2025 · Umbraco-CMS

Check if you run it

No confirmed exploitation is on record for CVE-2025-48953. EPSS is 0.18%. Act only if a listed version of Umbraco-CMS is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Version ranges on file
Affected products
vendor umbraco Umbraco-CMS 14.0.0, < 15.4.2

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor umbraco Umbraco-CMS 14.0.0, < 15.4.214.0.0, < 15.4.2

How to fix CVE-2025-48953

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-48953. EPSS is 0.18%. Act only if a listed version of Umbraco-CMS is installed.

Which versions are affected?

Compare what you have installed with umbraco Umbraco-CMS 14.0.0, < 15.4.2 14.0.0, < 15.4.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 3, 2025 · EUVD

    Detected

    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.

  2. Jun 3, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-48953

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-48953

    30-day exploitation probability 0.2%

    first.org
  • EUVDVulnerability recordEUVD-2025-16778

    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 versi

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.