Nextcloud Calendar attachments of local files are offered to downloaded_CVE-2025-66550

{
    "lastseen": "",
    "description": "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.",
    "published": "2025-12-05T16:56:44.680Z",
    "modified": "2025-12-05T18:41:24.347Z",
    "type": "cve",
    "title": "Nextcloud Calendar attachments of local files are offered to downloaded",
    "source": "GitHub_M",
    "references": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv\nhttps://github.com/nextcloud/calendar/pull/6971\nhttps://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769\nhttps://hackerone.com/reports/3112033",
    "id": "CVE-2025-66550",
    "bulletinFamily": "",
    "cwe": [
        "CWE-241"
    ],
    "cvelist": null,
    "sourceData": "nextcloud security-advisories >= 5.0.0-rc.1, < 5.2.4\nnextcloud security-advisories < 4.7.17",
    "sourceHref": "",
    "cvss": {
        "score": 5.7,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "security-advisories",
    "version": ">= 5.0.0-rc.1, < 5.2.4",
    "vendor": "nextcloud",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}