Nextcloud Server 26/27 Workflow Mod/Del via API Bypass (CVE-2023-49791)
CVE-2023-49791 Published on December 22, 2023
Workflows do not require password confirmation on API level
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when an attacker manages to get access to an active session of another user via another way, they could delete and modify workflows by sending calls directly to the API bypassing the password confirmation shown in the UI. Nextcloud Server versions 26.0.9 and 27.1.4 and Nextcloud Enterprise Server versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4 contain a patch for this issue. No known workarounds are available.
Vulnerability Analysis
CVE-2023-49791 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2023-49791. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity and availability.
Weakness Types
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2023-49791 has been classified to as an Authorization vulnerability or weakness.
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2023-49791 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2023-49791
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Affected Versions
nextcloud security-advisories:- Version >= 23.0.0, < 23.0.12.13 is affected.
- Version >= 24.0.0, < 24.0.12.9 is affected.
- Version >= 25.0.0, < 25.0.13.4 is affected.
- Version >= 26.0.0, < 26.0.9 is affected.
- Version >= 27.0.0, < 27.1.4 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.