{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2025-52691",
  "revision": 1,
  "title": "SmarterTools SmarterMail — unauthenticated upload to anywhere",
  "summary": "SmarterMail lets an unauthenticated attacker upload a file to any location on the mail server, which is enough to place an executable script where the server will go on to run it.",
  "source_type": "cve",
  "severity": "critical",
  "cvss": {
    "score": 10,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.85655,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2026-01-26",
    "prerequisites": "Network access to the SmarterMail interface; no credentials needed."
  },
  "mitre_attack": [
    "T1190",
    "T1505.003"
  ],
  "kill_chain": "initial_access",
  "recommended_action": "Upgrade SmarterMail to the fixed build now; exploit code is public and ransomware crews use it, so sweep the web directories for scripts you did not place.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2025-52691",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "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": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2025-52691",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "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-2025-52691",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-52691",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "exploit",
      "url": "https://github.com/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691?ref=labs.watchtowr.com"
    },
    {
      "type": "writeup",
      "url": "https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/"
    }
  ],
  "published_at": "2025-12-29T03:15:42.837Z",
  "issued_at": "2026-09-24T08:51:39.744Z",
  "tags": [
    "smartertools",
    "smartermail",
    "file-upload",
    "webshell",
    "ransomware",
    "kev"
  ]
}