{
  "cveId": "CVE-2019-18835",
  "url": "https://patchblox.com/security/cve/CVE-2019-18835",
  "summary": "CVE-2019-18835 is fixed in matrix-synapse on 1 platform by matrix-synapse 0.24.0\u002Bdfsg-1ubuntu0.1~esm1 (version 0.24.0\u002Bdfsg-1ubuntu0.1~esm1), released November 7, 2019. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "matrix-synapse: Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs",
  "description": "Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.",
  "published": "2019-11-07T16:15:00Z",
  "severity": "Medium",
  "epss": 0.00864,
  "epssPercentile": 0.58855,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "matrix-synapse",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.24.0\u002Bdfsg-1ubuntu0.1~esm1",
      "fix": "matrix-synapse 0.24.0\u002Bdfsg-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-matrix-synapse-0.24.0-dfsg-1ubuntu0.1-esm1",
      "released": "2019-11-07T16:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}