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Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads

Moderate severity GitHub Reviewed Published Jun 3, 2025 in umbraco/Umbraco-CMS

Package

nuget Umbraco.Cms (NuGet)

Affected versions

>= 14.0.0, <= 15.4.1

Patched versions

15.4.2

Description

Impact

Via a manipulated API request it's possible to upload a file that doesn't adhere with the configured allowable file extensions.

Patches

Patched in 15.4.2 and 16.0.0.

Workarounds

None available.

References

@AndyButland AndyButland published to umbraco/Umbraco-CMS Jun 3, 2025
Published by the National Vulnerability Database Jun 3, 2025
Published to the GitHub Advisory Database Jun 4, 2025
Reviewed Jun 4, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(7th percentile)

Weaknesses

CVE ID

CVE-2025-48953

GHSA ID

GHSA-fr6r-p8hv-x3c4

Source code

Credits

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