CVE-2025-66512 (GCVE-0-2025-66512)
Vulnerability from cvelistv5
Published
2025-12-05 16:22
Modified
2025-12-05 20:05
Severity ?
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CWE
  • CWE-80 - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Summary
Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an uploaded SVG outside of the Nextcloud Servers web page.
References
Impacted products
Vendor Product Version
nextcloud security-advisories Version: >= 32.0.0beta1, < 32.0.3
Version: < 31.0.12
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            "other": {
              "content": {
                "id": "CVE-2025-66512",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-05T20:04:51.050053Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2025-12-05T20:05:05.069Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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          "value": "Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an uploaded SVG outside of the Nextcloud Servers web page."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2025-12-05T16:22:50.206Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5"
        },
        {
          "name": "https://github.com/nextcloud/viewer/pull/3023",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/nextcloud/viewer/pull/3023"
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        {
          "name": "https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63",
          "tags": [
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        {
          "name": "https://hackerone.com/reports/3357808",
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      "source": {
        "advisory": "GHSA-qcw2-p26m-9gc5",
        "discovery": "UNKNOWN"
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      "title": "Nextcloud Server vulnerable to XSS in SVG images when opened outside of Nextcloud"
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  "cveMetadata": {
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    "cveId": "CVE-2025-66512",
    "datePublished": "2025-12-05T16:22:50.206Z",
    "dateReserved": "2025-12-03T15:28:02.992Z",
    "dateUpdated": "2025-12-05T20:05:05.069Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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