Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.19, 5.5.6, and 6.0.1, the calendar app allowed blindly booking appointments with a squential ID without known the appointment token. This vulnerability is fixed in 4.7.19, 5.5.6, and 6.0.1.
Advisories

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Fixes

Solution

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Workaround

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History

Fri, 05 Dec 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 05 Dec 2025 17:00:00 +0000

Type Values Removed Values Added
Description Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.19, 5.5.6, and 6.0.1, the calendar app allowed blindly booking appointments with a squential ID without known the appointment token. This vulnerability is fixed in 4.7.19, 5.5.6, and 6.0.1.
Title Nextcloud Calendar app allowed booking appointments without the generated token
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-12-05T18:32:44.271Z

Reserved: 2025-12-04T15:52:26.549Z

Link: CVE-2025-66546

cve-icon Vulnrichment

Updated: 2025-12-05T18:32:34.528Z

cve-icon NVD

Status : Received

Published: 2025-12-05T17:16:05.163

Modified: 2025-12-05T17:16:05.163

Link: CVE-2025-66546

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses