CVE-2026-45281

Vulnerability overview

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, with the knowledge of other users’ principal URL an attacker could possibly send a request to gain full access to their calendar. Therefore, the attacker must be an authenticated user. This is because of improper authorization controls in the backend of the calendar. If the attacker had access to the calendar, they would be able to view and modify it. It is recommended that the Nextcloud Server is upgraded to 33.0.3 or 32.0.9. It is recommended...

Affected product and versions

Product

nextcloud security-advisories, nextcloud server

Affected versions

>= >= 32.0.0, < 32.0.9, >= >= 33.0.0, < 33.0.3, >= 32.0.0 < 32.0.9, >= 33.0.0 < 33.0.3, >= 21.0.0 < 21.0.9.23, >= 22.0.0 < 22.2.10.39, >= 23.0.0 < 23.0.12.35, >= 24.0.0 < 24.0.12.34, >= 25.0.0 < 25.0.13.29, >= 26.0.0 < 26.0.13.26, >= 27.0.0 < 27.1.11.26, >= 28.0.0 < 28.0.14.17, >= 29.0.0 < 29.0.16.16, >= 30.0.0 < 30.0.17.9, >= 31.0.0 < 31.0.14.5

Fixed versions

32.0.9, 33.0.3, 21.0.9.23, 22.2.10.39, 23.0.12.35, 24.0.12.34, 25.0.13.29, 26.0.13.26, 27.1.11.26, 28.0.14.17, 29.0.16.16, 30.0.17.9, 31.0.14.5

Technical data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CWE

CWE-639