{
  "id": "CVE-2020-35730",
  "url": "https://spydr.io/cve/CVE-2020-35730",
  "published": "2020-12-28T20:15:13.150Z",
  "modified": "2026-06-17T03:14:12.273Z",
  "score": 6.1,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "score_source": "NVD",
  "epss": 0.3292,
  "epss_percentile": 0.9832,
  "exploited": true,
  "kev": {
    "added": "2023-06-22",
    "due": "2023-07-13",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability",
    "notes": "https://roundcube.net/news/2020/12/27/security-updates-1.4.10-1.3.16-and-1.2.13; https://nvd.nist.gov/vuln/detail/CVE-2020-35730"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "roundcube",
    "fedoraproject",
    "debian"
  ],
  "products": [
    "roundcube webmail",
    "fedoraproject fedora",
    "debian linux"
  ],
  "cwes": [
    "CWE-79"
  ],
  "description": "An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 6.1,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491",
      "tags": [
        "Issue Tracking",
        "Mailing List"
      ]
    },
    {
      "url": "https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.2.13",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.3.16",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://github.com/roundcube/roundcubemail/releases/tag/1.4.10",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/",
      "tags": [
        "Mailing List",
        "Release Notes"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/",
      "tags": [
        "Mailing List",
        "Release Notes"
      ]
    },
    {
      "url": "https://roundcube.net/download/",
      "tags": [
        "Product"
      ]
    },
    {
      "url": "https://www.alexbirnberg.com/roundcube-xss.html",
      "tags": [
        "Broken Link"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-35730",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2020-35730",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}