{
  "cveId": "CVE-2022-39374",
  "url": "https://patchblox.com/security/cve/CVE-2022-39374",
  "summary": "CVE-2022-39374 is fixed in matrix-synapse on 1 platform, first by DEBIAN-CVE-2022-39374, released May 26, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "matrix-synapse: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation",
  "description": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all further messages and state changes sent in that room from the vulnerable homeserver to be rejected. This issue has been patched in version 1.68.0",
  "published": "2023-05-26T07:15:00Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00941,
  "epssPercentile": 0.61199,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "matrix-synapse",
      "release": "Debian 14",
      "fixedVersion": "1.68.0-1",
      "fix": "DEBIAN-CVE-2022-39374",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-39374",
      "released": "2023-05-26T14:15:10Z"
    },
    {
      "platform": "linux",
      "product": "matrix-synapse",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.11.0-1ubuntu0.1~esm2",
      "fix": "matrix-synapse 1.11.0-1ubuntu0.1~esm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-matrix-synapse-1.11.0-1ubuntu0.1-esm2",
      "released": "2023-10-31T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "matrix-synapse",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.53.0-1ubuntu0.1~esm2",
      "fix": "matrix-synapse 1.53.0-1ubuntu0.1~esm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-matrix-synapse-1.53.0-1ubuntu0.1-esm2",
      "released": "2024-12-03T09:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}