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CVE-2025-66550

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CVE-2025-66550

Published: Dec 5, 2025

Modified: Dec 5, 2025

PUBLISHED

CVSS v3.1

5.7

MEDIUM

Description

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.17 and 5.2.4, when a malicious user creates a calendar event with a crafted attachment that links to a download link of a file on the same Nextcloud server, the file would be downloaded without the user confirming the action. This vulnerability is fixed in 4.7.17 and 5.2.4.

VendorProductVersions

nextcloud

security-advisories

affected
>= 5.0.0-rc.1, < 5.2.4
affected
< 4.7.17

Weaknesses (CWE)

CWE-241

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

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