Bug 2483833 (CVE-2026-45281) - CVE-2026-45281 nextcloud-server: Nextcloud Server: Authenticated users can gain full calendar access due to improper authorization.
Summary: CVE-2026-45281 nextcloud-server: Nextcloud Server: Authenticated users can ga...
Keywords:
Status: NEW
Alias: CVE-2026-45281
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2483847 2483848
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-01 21:45 UTC by Jon Moroney
Modified: 2026-06-09 08:56 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
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Description Jon Moroney 2026-06-01 21:45:32 UTC
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 that the Nextcloud Enterprise Server is upgraded to 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, 29.0.16.16, 28.0.14.17, 27.1.11.26, 26.0.13.26, 25.0.13.29, 24.0.12.34, 23.0.12.35, 22.2.10.39, or 21.0.9.23


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