CVE-2025-66550
5.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nextcloud | security-advisories | >= 5.0.0-rc.1, < 5.2.4 | affected |
| nextcloud | security-advisories | < 4.7.17 | affected |
Weaknesses
- CWE-241: CWE-241: Improper Handling of Unexpected Data Type
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv
- https://github.com/nextcloud/calendar/pull/6971
- https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769
- https://hackerone.com/reports/3112033
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.