{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2023-43770",
  "revision": 1,
  "title": "Roundcube — a link in plain text mail that runs script",
  "summary": "Roundcube rewrites links found in plain text messages into markup without cleaning them, so a crafted message runs script in the reader's session — cross-site scripting (XSS) that sits in the mailbox until opened. Fixed in 1.4.14, 1.5.4 and 1.6.3.",
  "source_type": "cve",
  "severity": "medium",
  "cvss": {
    "score": 6.1,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
    "version": "3.1"
  },
  "epss": 0.6366,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "low",
    "kev_added": "2024-02-12",
    "prerequisites": "The victim must open the message."
  },
  "remediation": {
    "patch_available": true,
    "fixed_in": [
      "Roundcube >= 1.4.14",
      "Roundcube >= 1.5.4",
      "Roundcube >= 1.6.3"
    ]
  },
  "mitre_attack": [
    "T1059.007"
  ],
  "kill_chain": "execution",
  "recommended_action": "Update Roundcube to 1.4.14, 1.5.4 or 1.6.3, whichever line you run. The flaw lives in the link rewriter, so no setting takes it out of the path.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2023-43770",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2023-43770",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2023-43770",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43770",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b"
    }
  ],
  "published_at": "2023-09-22T06:15:10.090Z",
  "issued_at": "2026-09-24T12:52:19.575Z",
  "tags": [
    "roundcube",
    "webmail",
    "xss",
    "email",
    "kev"
  ]
}