Security advisory

{
  "id": "ded9874044c7ce46e211ddf106284093ad9bc834eb3889a32d6f50f228b86bc8",
  "url": "https://osv.dev/vulnerability/CVE-2021-29432",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-29432",
    "summary": "Sydent is a reference matrix identity server. A malicious user could abuse Sydent to send out arbitrary emails from the Sydent email address. This could be used to construct plausible phishing emails, for example. This issue has been fixed in 4469d1d.",
    "evidence": "osv:CVE-2021-29432",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-29432",
      "aliases": [
        "CVE-2021-29432",
        "GHSA-mh74-4m5g-fcjx",
        "PYSEC-2021-23"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/matrix-org/sydent",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c2ab10897500dbba1c0d4be33f42985d81bbad7d"
                },
                {
                  "fixed": "4469d1d42b2b1612b70638224c07e19623039c42"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.3.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4469d1d42b2b1612b70638224c07e19623039c42"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c2ab10897500dbba1c0d4be33f42985d81bbad7d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.3.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "fosdem_2021-01-15",
            "v2.2.0",
            "v2.1.0",
            "v2.0.1",
            "v2.0.0",
            "v1.0.3",
            "v1.0.1",
            "v1.0.2",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29432.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:42.611462159Z",
      "provider": "osv",
      "references": [
        "https://github.com/matrix-org/sydent/releases/tag/v2.3.0",
        "https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42",
        "https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjx",
        "https://pypi.org/project/matrix-sydent/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-29432",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384526,
  "published_at": "2021-04-15T21:15:17.63+00:00"
}