5.7

CVE-2025-66550

Nextcloud Calendar attachments of local files are offered to downloaded

Calendar attachments of local files are offered to downloaded

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.
Mögliche Gegenmaßnahme
Calendar: * Disable app Calendar
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Nextcloud ≫ Calendar Version >= 4.0.0 < 4.7.17
Nextcloud ≫ Calendar Version >= 5.0.0 < 5.2.4
VulnDex Vulnerability Enrichment
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Weitere Schwachstelleninformationen
SystemNextcloud App
≫
Produkt Calendar
Version >= 4.0.0, < 4.7.17
Version >= 5.0.0, < 5.2.4
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.206
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 5.7 2.1 3.6
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
CWE-241 Improper Handling of Unexpected Data Type

The product does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (A-Z).

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv
Patch
Vendor Advisory
https://github.com/nextcloud/calendar/pull/6971
Issue Tracking
https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769
Patch
https://hackerone.com/reports/3112033
Vendor Advisory
Issue Tracking
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv
Third Party Advisory