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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769 Patch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv Patch, Vendor Advisory
- https://hackerone.com/reports/3112033 Issue Tracking, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.7 · nextcloudNVD modified 2026-10-18 14:10
Affected (CPE criteria) 1
cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*
References 4
- 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