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Vulnerability · Published Jul 30, 2025 · Assigned by GitHub_M

CVE-2025-54425Umbraco's Delivery API allows for cached requests to be returned with an invalid API key

Medium 5.3

In plain English

A medium-severity information exposure in Umbraco-CMS from umbraco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 66.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Umbraco is an ASP.NET CMS. In versions 13.0.0 through 13.9.2, 15.0.0 through 15.4.1 and 16.0.0 through 16.1.0, the content delivery API can be restricted from public access where an API key must be provided in a header to authorize the request. It's also possible to configure output caching, such that the delivery API outputs will be cached for a period of time, improving performance. There's an issue when these two things are used together, where caching doesn't vary by the header that contains the API key. As such, it's possible for a user without a valid API key to retrieve a response for a given path and query if it has recently been requested and cached by request with a valid key. This is fixed in versions 13.9.3, 15.4.4 and 16.1.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
NuGetumbraco.cms.api.delivery13.9.3GHSA-75vq-qvhr-7ffr
NuGetumbraco.cms.api.delivery15.4.4GHSA-75vq-qvhr-7ffr
NuGetumbraco.cms.api.delivery16.1.1GHSA-75vq-qvhr-7ffr

Affected products (as reported)

VendorProductVersions
umbraco Umbraco-CMS >= 13.0.0, < 13.9.3>= 15.0.0, < 15.4.4>= 16.0.0, < 16.1.1

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References