Note Mark: OIDC-registered users authenticated by submitting password "null"

{
  "id": "41125d0f7a7f9b29abbd6925cc316ced389e2a7ba6364e157a105fb9f6cce564",
  "url": "https://osv.dev/vulnerability/CVE-2026-41571",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Note Mark: OIDC-registered users authenticated by submitting password \"null\"",
    "summary": "Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt(\"null\") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: \"null\" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction. This issue has been patched in version 0.19.3.",
    "evidence": "osv:CVE-2026-41571",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-41571",
      "aliases": [
        "CVE-2026-41571",
        "GHSA-pxf8-6wqm-r6hh",
        "GO-2026-5557"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/enchant97/note-mark",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9f627bbb0cccebf872ec4b450ba2cd1d59ba9697"
                },
                {
                  "fixed": "a9e2a7fce6c98ae7e416572d18d898e579b5fdfc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "= 0.19.2"
                      },
                      {
                        "last_affected": "= 0.19.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a9e2a7fce6c98ae7e416572d18d898e579b5fdfc"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.19.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "= 0.19.2",
            "v0.19.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41571.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.775446494Z",
      "provider": "osv",
      "references": [
        "https://github.com/enchant97/note-mark/releases/tag/v0.19.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41571.json",
        "https://github.com/enchant97/note-mark/security/advisories/GHSA-pxf8-6wqm-r6hh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41571"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41571.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41571",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495738,
  "published_at": "2026-05-04T17:42:32.428+00:00"
}