Nextcloud Server CVE-2023-48304: Unauth Birthday Cal Toggle
CVE-2023-48304 Published on November 21, 2023
Nextcloud Server vulnerable to attacker enabling/disabling birthday calendar for any user
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and starting in version 22.0.0 and prior to versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Enterprise Server, an attacker could enable and disable the birthday calendar for any user on the same server. Nextcloud Server 25.0.11, 26.0.6, and 27.1.0 and Nextcloud Enterprise Server 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 contain patches for this issue. No known workarounds are available.
Vulnerability Analysis
CVE-2023-48304 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 no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is an Insecure Direct Object Reference / IDOR Vulnerability?
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CVE-2023-48304 has been classified to as an Insecure Direct Object Reference / IDOR vulnerability or weakness.
Products Associated with CVE-2023-48304
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Affected Versions
nextcloud security-advisories:- Version >= 25.0.0, < 25.0.11 is affected.
- Version >= 26.0.0, < 26.0.6 is affected.
- Version >= 27.0.0, < 27.1.0 is affected.
- Version >= 22.0.0, < 22.2.10.16 is affected.
- Version >= 23.0.0, < 23.0.12.11 is affected.
- Version >= 24.0.0, < 24.0.12.7 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.