{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.6.16"
              },
              {
                "introduced": "1.7.0"
              },
              {
                "fixed": "1.7.1"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ea1798a6fbf060abcc0ba73b2435036bf8016a5a"
            },
            {
              "introduced": "df9effa186f81d676962b941da4ebab5e05c3088"
            },
            {
              "fixed": "d40ec266240f2456a52c24ef2848e18bbfb5c300"
            }
          ],
          "repo": "https://github.com/roundcube/roundcubemail",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "OCD",
    "cwe_ids": [
      "CWE-184"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9818.json"
  },
  "details": "Roundcube's HTML sanitization path for message rendering allows loopback, localhost, RFC1918, link-local, and ULA URLs even when remote content loading is disabled. A remote attacker can send an HTML email that causes the victim's browser to issue requests to local or private-network services simply by opening the message preview.",
  "id": "CVE-2026-9818",
  "modified": "2026-07-08T05:38:35.902822014Z",
  "published": "2026-05-28T12:16:05.464Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/roundcube/roundcubemail/"
    },
    {
      "type": "ADVISORY",
      "url": "https://advisories.orangecyberdefense.com/advisories/163"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9818.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9818"
    },
    {
      "type": "FIX",
      "url": "https://github.com/roundcube/roundcubemail/commit/7b52353653a67e6073b97d70eb94047132b78556"
    },
    {
      "type": "FIX",
      "url": "https://github.com/roundcube/roundcubemail/commit/faf867432f51ebbe100382a70a9e3c042415ee1b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.16"
    },
    {
      "type": "FIX",
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.7.1"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Roundcube Local/Private URL Fetch Bypass"
}