{"id":"CVE-2026-45274","summary":"MyBooks: Unauthenticated Registration Bypass via Missing Server-Side ALLOW_REGISTER Enforcement","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.","aliases":["GHSA-3q85-5vj5-qx5v"],"modified":"2026-09-11T03:30:17.330596337Z","published":"2026-08-19T14:38:58.849Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45274.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-602"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/poxenstudio/mybooks","events":[{"introduced":"0"},{"fixed":"a1780c98b00566af7da2fc099fe38500efc02e92"},{"fixed":"35661edda0824dc4e0c1077f9ca75fd938f2e2b5"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.42.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["3.41.1","3.41.0","3.40.1","3.40.0","3.39.0","3.38.1","3.38.0","3.37.1","3.37.0","3.36.1","3.36.0","3.34.0","3.33.0","3.32.0","3.31.2","3.31.1","3.30.2","3.30.1","3.30.0","3.29.1","3.29.0","3.28.0","3.27.0","3.26.0","3.25.1","3.25.0","3.24.1","3.23.0","3.22.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45274.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}