fkie_cve-2025-66550
Vulnerability from fkie_nvd
Published
2025-12-05 17:16
Modified
2025-12-08 18:26
Severity ?
5.7 (Medium) - 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.
References
security-advisories@github.comhttps://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769
security-advisories@github.comhttps://github.com/nextcloud/calendar/pull/6971
security-advisories@github.comhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv
security-advisories@github.comhttps://hackerone.com/reports/3112033
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2025-66550",
  "lastModified": "2025-12-08T18:26:49.133",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.1,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-05T17:16:05.500",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nextcloud/calendar/pull/6971"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://hackerone.com/reports/3112033"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-241"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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