CVEvulnerability
CVE-2025-66550
5.7 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2025-12-05
- Last modified
- 2026-10-18
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.7 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-241
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.
Affected configurations
• nextcloud calendar (>= 4.0.0 < 4.7.17)
• nextcloud calendar (>= 5.0.0 < 5.2.4)
Related
Weakness · CWE (1)
- CWE-241 Improper Handling of Unexpected Data Type weakness
References
- https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769 Patch
- https://github.com/nextcloud/calendar/pull/6971 Issue Tracking
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv Patch, Vendor Advisory
- https://hackerone.com/reports/3112033 Issue Tracking, Vendor Advisory