{
  "cveId": "CVE-2026-118177",
  "url": "https://patchblox.com/security/cve/CVE-2026-118177",
  "summary": "CVE-2026-118177 is fixed in thunderbird on 1 platform, first by DEBIAN-CVE-2026-118177, released October 31, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "thunderbird: When looking for calendars in a directory on a server, during account setup or when adding a new network calendar, Th...",
  "description": "When looking for calendars in a directory on a server, during account setup or when adding a new network calendar, Thunderbird accepted calendar locations pointing to other servers, local files or network shares. A malicious server, or a network attacker when the lookup used plain HTTP, could make Thunderbird subscribe to such a location. On Windows this could leak the user\u0027s NTLM credentials to an attacker-controlled host on every calendar refresh, and changes to the calendar could be written to the attacker\u0027s share or overwrite a local file. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.",
  "published": "2026-10-27T19:17:29Z",
  "severity": "critical",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00452,
  "epssPercentile": 0.39514,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "thunderbird",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1:153.6.0esr-1~deb12u2",
      "fix": "DEBIAN-CVE-2026-118177",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-118177",
      "released": "2026-10-31T22:18:21Z"
    },
    {
      "platform": "linux",
      "product": "thunderbird",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1:153.6.0esr-1~deb13u1",
      "fix": "DEBIAN-CVE-2026-118177",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-118177",
      "released": "2026-10-31T22:18:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}