# CVE-2026-27807

## Summary

- **CVE ID:** CVE-2026-27807
- **Severity:** MEDIUM
- **CVSS Score:** 4.9 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-776
- **Published:** Mar 6, 2026
- **Last Modified:** Mar 12, 2026

## Description

MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload YAML files to create/update various entities (e.g., assignment settings). These YAML files are parsed with aliases enabled. This issue has been patched in version 2.9.4.

## Affected Products

- MarkUsProject — Markus (< 2.9.4)

## References

- [CNA](https://github.com/MarkUsProject/Markus/security/advisories/GHSA-m9rx-85mx-q9h6)
- [CNA](https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._