Full authentication bypass if SASL authorization username is specified

{
  "id": "a220cc0628e8099accaa128c83efc8ca1ab540b3cfb617e856191458b7cd453f",
  "url": "https://osv.dev/vulnerability/CVE-2023-27582",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Full authentication bypass if SASL authorization username is specified",
    "summary": "maddy is a composable, all-in-one mail server. Starting with version 0.2.0 and prior to version 0.6.3, maddy allows a full authentication bypass if SASL authorization username is specified when using the PLAIN authentication mechanisms. Instead of validating the specified username, it is accepted as is after checking the credentials for the authentication username. maddy 0.6.3 includes the fix for the bug. There are no known workarounds.",
    "evidence": "osv:CVE-2023-27582",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2023-27582",
      "aliases": [
        "CVE-2023-27582",
        "GHSA-4g76-w3xw-2x6w",
        "GO-2023-1630"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/foxcpp/maddy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b54c705e2d3f415daa853a2e146322f4f29a8dca"
                },
                {
                  "fixed": "ee1e340c77ed04f1f76aed826bc6a53c07fddc75"
                },
                {
                  "fixed": "55a91a37b71210f34f98f4d327c30308fe24399a"
                },
                {
                  "fixed": "9f58cb64b39cdc01928ec463bdb198c4c2313a9c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:maddy_project:maddy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.2.0"
                      },
                      {
                        "fixed": "0.6.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "55a91a37b71210f34f98f4d327c30308fe24399a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9f58cb64b39cdc01928ec463bdb198c4c2313a9c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ee1e340c77ed04f1f76aed826bc6a53c07fddc75"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.6.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.4",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-27582.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.532030509Z",
      "provider": "osv",
      "references": [
        "https://github.com/foxcpp/maddy/releases/tag/v0.6.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/27xxx/CVE-2023-27582.json",
        "https://github.com/foxcpp/maddy/security/advisories/GHSA-4g76-w3xw-2x6w",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-27582",
        "https://github.com/foxcpp/maddy/commit/55a91a37b71210f34f98f4d327c30308fe24399a",
        "https://github.com/foxcpp/maddy/commit/9f58cb64b39cdc01928ec463bdb198c4c2313a9c"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287",
          "CWE-305"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": ">= 0.2.0  0.6.3"
                  },
                  {
                    "last_affected": ">= 0.2.0  0.6.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/27xxx/CVE-2023-27582.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-27582",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521183,
  "published_at": "2023-03-13T21:40:23.225+00:00"
}