What is CVE-2023-39961?

CVE-2023-39961 is a vulnerability in Nextcloud Server that allows users to add an image inline into a text file when a folder with images or an image was shared without download permissions.

How does CVE-2023-39961 affect Nextcloud Server?

CVE-2023-39961 affects Nextcloud Server versions 24.0.4 and prior to versions 25.0.9, 26.0.4, and 27.0.1.

What is the severity of CVE-2023-39961?

The severity of CVE-2023-39961 is medium with a CVSS score of 4.3.

How can I fix CVE-2023-39961?

To fix CVE-2023-39961, update Nextcloud Server to version 25.0.9, 26.0.4, or 27.0.1.

Where can I find more information about CVE-2023-39961?

You can find more information about CVE-2023-39961 on the GitHub security advisory page and the HackerOne report.

Vulnerability/
CVE-2023-39961

medium

4.3

CWE

284

10/8/2023

10/10/2024

CVE-2023-39961: Text does not respect "Allow download" permissions

First published: Thu Aug 10 2023(Updated: )

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 24.0.4 and prior to versions 25.0.9, 26.0.4, and 27.0.1, when a folder with images or an image was shared without download permissions, the user could add the image inline into a text file and download it. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

Credit: security-advisories@github.com security-advisories@github.com

Affected Software	Affected Version	How to fix
Nextcloud Nextcloud Server	>=25.0.0<25.0.9
Nextcloud Nextcloud Server	>=25.0.0<25.0.9
Nextcloud Nextcloud Server	>=26.0.0<26.0.4
Nextcloud Nextcloud Server	>=26.0.0<26.0.4
Nextcloud Nextcloud Server	=27.0.0
Nextcloud Nextcloud Server	=27.0.0

Remedy

https://github.com/nextcloud/text/pull/4481

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Reference Links

Frequently Asked Questions

What is CVE-2023-39961?
CVE-2023-39961 is a vulnerability in Nextcloud Server that allows users to add an image inline into a text file when a folder with images or an image was shared without download permissions.
How does CVE-2023-39961 affect Nextcloud Server?
CVE-2023-39961 affects Nextcloud Server versions 24.0.4 and prior to versions 25.0.9, 26.0.4, and 27.0.1.
What is the severity of CVE-2023-39961?
The severity of CVE-2023-39961 is medium with a CVSS score of 4.3.
How can I fix CVE-2023-39961?
To fix CVE-2023-39961, update Nextcloud Server to version 25.0.9, 26.0.4, or 27.0.1.
Where can I find more information about CVE-2023-39961?
You can find more information about CVE-2023-39961 on the GitHub security advisory page and the HackerOne report.

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version/nextcloud nextcloud server/26.0.0
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