# CVE-2026-51876: DeepTutor authorization bypass in book confirmation

Source: https://junglewise.ai/threats/cve-2026-51876-deeptutor-1-4-0-contains-an-authorization-bypass-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-01. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-51876 · Severity: info · Published 2026-10-01

DeepTutor is a tutoring platform that manages educational content including books and materials. A vulnerability in version 1.4.0 allows anyone with knowledge of a book ID to modify book metadata and content without authorization, potentially corrupting or defacing educational materials.

Technologies: [HKUDS DeepTutor](https://junglewise.ai/threats/technologies/deeptutor). Vendors: [HKUDS](https://junglewise.ai/threats/vendors/hkuds).

## 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

## References

- [https://gist.github.com/Ro1ME/c5685936179edcbf942f3fdd745d1473](https://gist.github.com/Ro1ME/c5685936179edcbf942f3fdd745d1473)
- [https://github.com/HKUDS/DeepTutor/issues/514](https://github.com/HKUDS/DeepTutor/issues/514)

## Related threats

- [DeepTutor code injection in shell execution tool](https://junglewise.ai/threats/cve-2026-51881-deeptutor-1-4-0-contains-code-injection-in-exectool-execute)
- [deeptutor path traversal in EditFileTool.execute](https://junglewise.ai/threats/cve-2026-51880-deeptutor-1-4-0-contains-a-path-traversal-issue-in-editfiletool)
- [DeepTutor authorization bypass in TutorBotManager file write](https://junglewise.ai/threats/cve-2026-51879-deeptutor-1-4-0-contains-an-authorization-bypass-through-a-user)
- [DeepTutor authorization bypass in session regeneration](https://junglewise.ai/threats/cve-2026-51878-deeptutor-1-4-0-contains-an-authorization-bypass-through-a-user)
- [DeepTutor command execution in ExecTool](https://junglewise.ai/threats/cve-2026-51870-deeptutor-v1-4-0-is-vulnerable-to-command-execution-in-tutorbot)