{
  "id": "CVE-2023-43770",
  "url": "https://spydr.io/cve/CVE-2023-43770",
  "published": "2023-09-22T06:15:10.090Z",
  "modified": "2026-06-17T06:26:24.770Z",
  "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": 0.6366,
  "epss_percentile": 0.99198,
  "exploited": true,
  "kev": {
    "added": "2024-02-12",
    "due": "2024-03-04",
    "action": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
    "ransomware": "Unknown",
    "name": "Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability",
    "notes": "https://roundcube.net/news/2023/09/15/security-update-1.6.3-released ; https://nvd.nist.gov/vuln/detail/CVE-2023-43770"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "roundcube",
    "debian"
  ],
  "products": [
    "roundcube webmail",
    "debian_linux"
  ],
  "cwes": [
    "CWE-79"
  ],
  "description": "Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 6.1,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "https://roundcube.net/news/2023/09/15/security-update-1.6.3-released",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43770",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43770",
  "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."
    }
  ]
}