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Nextcloud CVE-2025-66546

| EUVD-2025-201445 LOW
Authorization Bypass Through User-Controlled Key (CWE-639)
2025-12-05 security-advisories@github.com
Authentication Bypass Nextcloud
3.3
CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
EUVD ID Assigned
Mar 15, 2026 - 17:08 euvd
EUVD-2025-201445
Analysis Generated
Mar 15, 2026 - 17:08 vuln.today
Patch released
Mar 15, 2026 - 17:08 nvd
Patch available
CVE Published
Dec 05, 2025 - 17:16 nvd
LOW 3.3

DescriptionNVD

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.

Analysis

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.

Technical ContextAI

This vulnerability is classified as Authorization Bypass Through User-Controlled Key (CWE-639).

RemediationAI

A vendor patch is available. Apply it as soon as possible and verify the fix.

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CVE-2025-66546 vulnerability details – vuln.today
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