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GHSA-75vq-qvhr-7ffr

MediumCVSS 5.3 / 10

Published Jul 29, 2025·Last modified Jul 30, 2025

Affected Components(0)

No affected components available

Description

Impact

Umbraco's content delivery API can be restricted from public access such that 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 though in that the 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.

Patches

Patches will be available in 13.9.3, 15.4.4 and 16.1.1.

Workarounds

Workaround is to remove or reduce the time period of the output caching or to provide other restrictions to access the delivery API such as by IP.

References

Content delivery API documentation: https://docs.umbraco.com/umbraco-cms/reference/content-delivery-api

Risk Scores

Base Score

5.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.

Threat Intelligence

4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS

N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity

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