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Medium

Synapse does not apply enough checks to servers requesting auth events of events in a room

Type: advisorySources: OSV

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2022-39335
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 02:10 UTC · Revision 1

Source evidence

Synapse does not apply enough checks to servers requesting auth events of events in a room

core-osv · Original source

Published 26 May 2023, 13:36 UTC

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.

osv:CVE-2022-39335
Complete source record
{
  "id": "073c53a1a0629a1c4966e603a30ea5ef6c807931dded1d52b1dad7cdf796ad54",
  "url": "https://osv.dev/vulnerability/CVE-2022-39335",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Synapse does not apply enough checks to servers requesting auth events of events in a room",
    "summary": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.",
    "evidence": "osv:CVE-2022-39335",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2022-39335",
      "aliases": [
        "CVE-2022-39335",
        "GHSA-45cj-f97f-ggwv",
        "PYSEC-2023-65"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/matrix-org/synapse",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6b097a3e17ec52b2486a91c8dcf8f8cb53f740f3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.69.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.69.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.69.0rc4",
            "v1.69.0rc3",
            "v1.69.0rc2",
            "v1.69.0rc1",
            "v1.63.0rc1",
            "v1.62.0rc1",
            "v1.52.0rc1",
            "v1.49.0rc1",
            "v1.40.0rc1",
            "v1.36.0rc1",
            "v1.35.0rc1",
            "v1.34.0rc1",
            "v1.32.0rc1",
            "v1.31.0rc1",
            "v1.30.0rc1",
            "v1.29.0rc1",
            "v1.27.0rc1",
            "v1.24.0rc1",
            "v1.23.0rc1",
            "v1.17.0rc1",
            "v1.18.0rc1",
            "v1.16.0rc1",
            "v1.15.0rc1",
            "v1.14.0rc1",
            "v1.12.0rc1",
            "v1.6.0rc1",
            "v1.11.0rc1",
            "v1.3.0rc1",
            "v1.1.0rc2",
            "v1.1.0rc1",
            "v1.10.0rc1",
            "v1.9.0rc1",
            "v1.9.0.dev2",
            "v1.9.0.dev1",
            "v1.8.0rc1",
            "v1.5.0rc1",
            "v1.4.0rc1",
            "v0.99.5.1.dev0",
            "v0.99.4rc1",
            "v0.99.2rc1",
            "v0.99.1rc1",
            "hhs-8",
            "hhs-7",
            "hhs-6",
            "hhs-5",
            "hhs-3",
            "hhs-2",
            "hhs-1",
            "v0.32.2",
            "v0.32.0",
            "v0.32.0rc1",
            "v0.28.0-rc1",
            "v0.25.0-rc1",
            "v0.23.0-rc2",
            "v0.23.0-rc1",
            "v0.18.5",
            "v0.18.4",
            "v0.18.3",
            "v0.18.2",
            "v0.18.1",
            "v0.18.0",
            "v0.17.3",
            "v0.17.2",
            "v0.17.1",
            "v0.17.0",
            "v0.16.1-r1",
            "v0.16.1",
            "v0.16.0",
            "v0.14.0",
            "v0.13.3",
            "v0.13.2",
            "v0.13.1",
            "v0.12.0",
            "v0.11.1",
            "v0.11.0-r2",
            "v0.11.0-r1",
            "v0.11.0",
            "v0.10.0-r2",
            "v0.10.0-r1",
            "v0.10.0",
            "v0.9.3",
            "v0.9.2-r2",
            "v0.9.2-r1",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0-r5",
            "v0.9.0-r4",
            "v0.9.0-r3",
            "v0.9.0-r2",
            "v0.9.0-r1",
            "v0.9.0",
            "v0.8.1-r4",
            "v0.8.1-r3",
            "v0.8.1-r2",
            "v0.8.1-r1",
            "v0.8.1",
            "v0.8.0",
            "v0.7.1-r4",
            "v0.7.1-r3",
            "v0.7.1-r2",
            "v0.7.1-r1",
            "v0.7.1",
            "v0.7.0f",
            "v0.7.0e",
            "v0.7.0d",
            "v0.7.0c",
            "v0.7.0b",
            "v0.7.0a",
            "v0.7.0",
            "v0.6.1f",
            "v0.6.1e",
            "v0.6.1d",
            "v0.6.1c",
            "v0.6.1b",
            "v0.6.1a",
            "v0.6.1",
            "v0.6.0b",
            "v0.6.0a",
            "v0.6.0",
            "v0.5.4a",
            "v0.5.4",
            "v0.5.3c",
            "v0.5.3b",
            "v0.5.3a",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.2",
            "v0.4.1",
            "v0.3.4",
            "v0.3.3",
            "v0.3.0",
            "v0.2.2",
            "v0.2.1a",
            "v0.2.1",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-39335.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.013719791Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39335.json",
        "https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-39335",
        "https://github.com/matrix-org/synapse/issues/13288",
        "https://github.com/matrix-org/synapse/pull/13823"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39335.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-39335",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509402,
  "published_at": "2023-05-26T13:36:56.436+00:00"
}