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CVE-2026-45274— MyBooks: Unauthenticated Registration Bypass via Missing Server-Side ALLOW_REGISTER Enforcement

Quick assessment

Affected
PoxenStudio talebook
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MyBooks（也被称为 Talebook）是一个电子书管理 Web 服务器。在版本 3.41.2 及更早版本中， 文件中的 处理器在处理 请求时，未强制执行 配置标志。尽管前端在 标志为 时会隐藏注册控件，但该后端端点仍允许调用。未认证的远程攻击者可以直接调用该端点，在管理员已禁用公开注册的功能的实例上创建有效账户。 此外， 中的 函数也未验证账户的“激活状态”标志，因此新创建且尚未激活的账户可以立即进行身份验证，并访问用户级别的 API 功能。 此漏洞绕过了预期的账户创建策略，攻击者可借此获取低权限账户，从而触

CVSS 6.9 · Medium EPSS 0.52% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
PoxenStudio talebook < 3.42.0 affected
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I. Basic Information for CVE-2026-45274

Vulnerability Information
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Vulnerability Title
MyBooks: Unauthenticated Registration Bypass via Missing Server-Side ALLOW_REGISTER Enforcement
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端安全的客户端实施
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PoxenStudio talebook < 3.42.0 -

II. Public POCs for CVE-2026-45274

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III. Intelligence Information for CVE-2026-45274

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Patches & Fixes for CVE-2026-45274 (2)

Vendor Advisories for CVE-2026-45274 (1)

Same Patch Batch · PoxenStudio · 2026-08-19 · 3 CVEs total

CVE-2026-45272 9.4 CRITICAL MyBooks: Remote Code Execution via SOCIAL_AUTH Key Name Injection in Python Config File
CVE-2026-45273 8.7 HIGH MyBooks: Privilege Escalation via Missing Authorization on Admin Settings Endpoint

IV. Related Vulnerabilities

Same product: talebook
Same vendor: PoxenStudio
Same weakness: CWE-602

V. Comments for CVE-2026-45274

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