CVE-2026-45274 MyBooks: Unauthenticated Registration Bypass via Missing Server-Side ALLOW_REGISTER Enforcement
Attackers can bypass registration restrictions to create accounts and gain unauthorized access to user-level features in MyBooks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45274?
CVE-2026-45274 is a medium-severity missing authorization vulnerability in PoxenStudio talebook, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-602
Which versions are affected by CVE-2026-45274?
How do I fix CVE-2026-45274?
No fix has been published for CVE-2026-45274 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-45274 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45274 exists.
Sources
Also known as GHSA-3q85-5vj5-qx5v.