Nextcloud Server V22.0.027.0.1: Subfolder Access Bypass (CVE-2023-39952)
CVE-2023-39952 Published on August 10, 2023
Advanced permissions not respected when copying entire group folders
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1, a user can access files inside a subfolder of a groupfolder accessible to them, even if advanced permissions would block access to the subfolder. Nextcloud Server versions 25.0.8, 26.0.3, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1 contain a patch for this issue. No known workarounds are available.
Vulnerability Analysis
CVE-2023-39952 is exploitable with network access, and requires 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 high impact on confidentiality, with no 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-2023-39952 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2023-39952
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Affected Versions
nextcloud security-advisories:- Version >= 22.0.0, < 22.2.10.13 is affected.
- Version >= 23.0.0, < 23.0.12.8 is affected.
- Version >= 24.0.0, < 24.0.12.4 is affected.
- Version >= 25.0.0, < 25.0.8 is affected.
- Version >= 26.0.0, < 26.0.3 is affected.
- Version >= 27.0.0, < 27.0.1 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.