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.

INFO

Published Date :

2025-12-05T16:56:44.680Z

Last Modified :

2025-12-05T18:41:24.347Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2025-66550 vulnerability.

Vendors Products
Nextcloud
  • Calendar
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-66550.

URL Resource
https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769 cve-icon cve-icon
https://github.com/nextcloud/calendar/pull/6971 cve-icon cve-icon
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv cve-icon cve-icon
https://hackerone.com/reports/3112033 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact