# CVE-2026-12271: Themeum Tutor LMS IDOR in quiz attempt modification

Source: https://junglewise.ai/threats/cve-2026-12271-themeum-tutor-lms-idor-in-quiz-attempt-modification  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-13. Updated: 2026-07-13  
License: CC BY 4.0 with a link back

CVE-2026-12271 · Severity: info · CVSS 5.4 · Published 2026-07-13

Tutor LMS is a popular WordPress plugin used to create and manage online courses and quizzes. A security flaw allows students to modify or force-complete the quiz attempts of other students. This could result in unauthorized changes to grades, pass/fail results, and the integrity of educational records within the platform.

Technologies: [Themeum Tutor LMS](https://junglewise.ai/threats/technologies/tutor-lms). Vendors: [Themeum](https://junglewise.ai/threats/vendors/themeum).

## Quick answers

**Is CVE-2026-12271 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-12271 being exploited in the wild.

**How severe is CVE-2026-12271?** Informational severity, with a CVSS score of 5.4, published 13 July 2026.

**Which products and versions are affected?** Themeum Tutor LMS < 3.9.13.

**Is there a fix for CVE-2026-12271?** A patch was published on 2026-07-13: Fixed in version 3.9.13 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-12271 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-12271?** Check whether you run Themeum Tutor LMS 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 Insecure Direct Object Reference (IDOR) exists in the quiz answering logic of Tutor LMS before version 3.9.13. The vulnerability occurs because the plugin performs an ownership check on a scalar 'attempt_id' parameter but subsequently uses keys from an 'attempt' array parameter to perform database writes. An attacker with subscriber-level access can provide their own valid attempt ID to pass the initial authorization check, while using a victim's attempt ID as the array key to overwrite the victim's quiz data. This allows an attacker to modify answers, change earned marks, and force-complete in-progress quizzes belonging to other users. The issue is fixed in version 3.9.13.

## Affected products

- Themeum Tutor LMS < 3.9.13

## Timeline

- 2026-06-22: disclosed: Publicly published by WPScan
- 2026-07-13: advisory: NVD publication date
- 2026-07-13: patched: Fixed in version 3.9.13

## References

- [https://wpscan.com/vulnerability/ca99ea35-4bf8-4dc8-a817-79fb9fa1c5bd/](https://wpscan.com/vulnerability/ca99ea35-4bf8-4dc8-a817-79fb9fa1c5bd/)

## Related threats

- [Tutor LMS insecure direct object reference in API routing](https://junglewise.ai/threats/cve-2026-93779-the-tutor-lms-elearning-and-online-course-solution-plugin-for)
- [Themeum Tutor LMS stored cross-site scripting](https://junglewise.ai/threats/cve-2026-111407-improper-neutralization-of-input-during-web-page-generation)
- [Tutor LMS insecure direct object reference in course update](https://junglewise.ai/threats/cve-2026-92715-the-tutor-lms-elearning-and-online-course-solution-plugin-for)
- [Tutor LMS stored cross-site scripting via display_name](https://junglewise.ai/threats/cve-2026-93681-the-tutor-lms-elearning-and-online-course-solution-plugin-for)
- [Themeum Tutor LMS reflected cross-site scripting vulnerability](https://junglewise.ai/threats/cve-2026-42702-improper-neutralization-of-input-during-web-page-generation-cross)