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CVE-2025-66550

🗓️ 05 Dec 2025 16:56:44Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 57 Views

Nextcloud Calendar can download local attachments without user confirmation; fixed in 4.7.17 and 5.2.4.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
bdu_fstec
BDU FSTEC
NextCloud Calendar Data Compromise
19 Mar 202600:00
–bdu_fstec
circl
Circl
CVE-2025-66550
5 Dec 202518:13
–circl
cnnvd
CNNVD
NextCloud Calendar security vulnerability
5 Dec 202500:00
–cnnvd
cvelist
Cvelist
CVE-2025-66550 Nextcloud Calendar attachments of local files are offered to downloaded
5 Dec 202516:56
–cvelist
euvd
EUVD
EUVD-2025-201443
5 Dec 202516:56
–euvd
nextcloud
Nextcloud
Calendar attachments of local files are offered to downloaded
5 Dec 202507:57
–nextcloud
hackerone
Hacker One
Nextcloud: Calendar attachments of local files are offered to downloaded
25 Apr 202507:08
–hackerone
mend
Mend
CVE-2025-66550
5 Dec 202516:56
–mend
nvd
NVD
CVE-2025-66550
5 Dec 202517:16
–nvd
ptsecurity
Positive Technologies
PT-2025-49290
5 Dec 202500:00
–ptsecurity
Rows per page
NVD
Vulners
Node
OR
nextcloudcalendarRange4.0.0–4.7.17
nextcloudcalendarRange5.0.0–5.2.4
[
  {
    "vendor": "nextcloud",
    "product": "security-advisories",
    "versions": [
      {
        "version": ">= 5.0.0-rc.1, < 5.2.4",
        "status": "affected"
      },
      {
        "version": "< 4.7.17",
        "status": "affected"
      }
    ]
  }
]

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18 Oct 2026 14:10Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.15.7
EPSS0.00341
SSVC
57