Nextcloud Server <=27.0.1: Image Sharing Allows Unauthorized File Download
CVE-2023-39961 Published on August 10, 2023
Text does not respect "Allow download" permissions
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.
Vulnerability Analysis
CVE-2023-39961 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2023-39961 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2023-39961
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Affected Versions
nextcloud security-advisories:- Version >= 24.0.4, < 24.0.12.5 is affected.
- Version >= 25.0.0, < 25.0.9 is affected.
- Version >= 27.0.0, < 27.0.1 is affected.
- Version >= 26.0.0, < 26.0.4 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.