Nextcloud Server: Missing PSW Confirm allows App PW creation (v20-27)
CVE-2023-39963 Published on August 10, 2023
Missing password confirmation when creating app passwords
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 20.0.0 and prior to versions 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a missing password confirmation allowed an attacker, after successfully stealing a session from a logged in user, to create app passwords for the victim. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 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-2023-39963 can be exploited with local system 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 high impact on confidentiality and integrity, and a small impact on 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-2023-39963 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2023-39963
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Affected Versions
nextcloud security-advisories:- Version >= 20.0.0, < 20.0.14.15 is affected.
- Version >= 21.0.0, < 21.0.9.13 is affected.
- Version >= 22.0.0, < 22.2.10.14 is affected.
- Version >= 23.0.0, < 23.0.12.9 is affected.
- Version >= 24.0.0, < 24.0.12.5 is affected.
- Version >= 25.0.0, < 25.0.9 is affected.
- Version >= 26.0.0, < 26.0.4 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.