Quick answers
- Is CVE-2026-51876 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-51876 being exploited in the wild.
- How severe is CVE-2026-51876?
- Informational severity, published 1 October 2026.
- Which products and versions are affected?
- HKUDS DeepTutor 1.4.0.
- Is there a fix for CVE-2026-51876?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-51876 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-51876?
- Check whether you run HKUDS DeepTutor at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An object-authorization vulnerability (CWE-284) in the book confirmation flow (storage.py:_atomic_write_text) fails to validate whether a caller is authorized to modify a specific book object. An unauthenticated or unauthorized attacker can submit a confirm-proposal request using a publicly exposed book_id to overwrite persisted metadata and spine content. No authentication or special network access is required beyond HTTP access to the application.
Affected products
- HKUDS DeepTutor 1.4.0
Timeline
- 2026-10-01: disclosed