5.7Medium
CVE-2025-66550Nextcloud Calendar attachments of local files are offered to downloaded
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.
Weakness (CWE):
CWE-241
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| nextcloud | calendar | 4.0.0 – < 4.7.17 | |
| nextcloud | security-advisories | >= 5.0.0-rc.1, < 5.2.4, < 4.7.17 |
References and patches
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv PatchVendor Advisory
- https://github.com/nextcloud/calendar/pull/6971 Issue Tracking
- https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769 Patch
- https://hackerone.com/reports/3112033 Issue TrackingVendor Advisory
CPE matches (NVD) (2)
cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*≥ 4.0.0 < 4.7.17cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*≥ 5.0.0 < 5.2.4