{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.42.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a1780c98b00566af7da2fc099fe38500efc02e92"
            },
            {
              "fixed": "35661edda0824dc4e0c1077f9ca75fd938f2e2b5"
            }
          ],
          "repo": "https://github.com/poxenstudio/mybooks",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3q85-5vj5-qx5v"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-602"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45274.json"
  },
  "details": "MyBooks is anebook management web server also known as Talebook. In 3.41.2 and earlier, the SignUp.post handler for POST /api/user/sign_up in webserver/handlers/user.py does not enforce the ALLOW_REGISTER configuration flag, even though the frontend hides registration controls when the flag is false. An unauthenticated remote attacker can call the endpoint directly and create a valid account on an instance whose administrator disabled public registration. The process_auth_header function in webserver/handlers/base.py also does not verify the account's active flag, so the newly created and unactivated account can authenticate immediately and access user-level API functionality. The bypass defeats the intended account-creation policy and can supply the low-privilege account required by related authorization vulnerabilities. This issue is fixed in version 3.42.0.",
  "id": "CVE-2026-45274",
  "modified": "2026-09-11T03:30:17.330596337Z",
  "published": "2026-08-19T14:38:58.849Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/PoxenStudio/mybooks/releases/tag/3.42.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45274.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/PoxenStudio/mybooks/security/advisories/GHSA-3q85-5vj5-qx5v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45274"
    },
    {
      "type": "FIX",
      "url": "https://github.com/PoxenStudio/mybooks/commit/a1780c98b00566af7da2fc099fe38500efc02e92"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MyBooks: Unauthenticated Registration Bypass via Missing Server-Side ALLOW_REGISTER Enforcement"
}