CVE-2025-66550
- Source
- https://cve.org/CVERecord?id=CVE-2025-66550
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66550.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-66550
- Aliases
-
- GHSA-f29c-ppmv-8mcv
- Published
- 2025-12-05T16:56:44Z
- Modified
- 2026-10-24T02:30:36Z
- Severity
-
- 5.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- Nextcloud Calendar attachments of local files are offered to downloaded
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-241" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66550.json" }- References
-
- https://hackerone.com/reports/3112033
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66550.json
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv
- https://nvd.nist.gov/vuln/detail/CVE-2025-66550
- https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769
- https://github.com/nextcloud/calendar/pull/6971
Affected packages
Git / github.com/nextcloud/calendar
Affected ranges
- Type
- GIT
- Repo
- https://github.com/nextcloud/calendar
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "cpe": "cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*", "range": [ { "introduced": "4.0.0" }, { "fixed": "4.7.17" } ], "source": "CPE_RANGE" }, { "cpe": "cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*", "range": [ { "introduced": "5.0.0" }, { "fixed": "5.2.4" } ], "source": "CPE_RANGE" }, { "range": [ { "fixed": "63a6c398db01391eb9fd5297a0d4c3d6e614f769" } ], "source": "REFERENCES_COMMIT" } ] }