Auth bypass in Nextcloud Server
CVE-2023-49791
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.
EPSS: 0.006 (45.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
Affected products
- Nextcloud Nextcloud_server
- Nextcloud Security-advisories — versions >= 23.0.0, < 23.0.12.13, >= 24.0.0, < 24.0.12.9, >= 25.0.0, < 25.0.13.4
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Permissions Required, x_refsource_MISC)
Frequently asked questions
- What is CVE-2023-49791?
- CVE-2023-49791 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 5.4/10. Published 2023-12-22.
- How severe is CVE-2023-49791?
- Medium severity. CVSS v3 base score is 5.4 out of 10.