Is CVE-2026-28405 actively exploited?

CVE-2026-28405 has no public evidence of in-the-wild exploitation as of 2026-03-10.

What is the CVSS score for CVE-2026-28405?

CVE-2026-28405 has a CVSS score of 8 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

How do I patch CVE-2026-28405?

Patch guidance is available from markusproject security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-28405.

Which products are affected by CVE-2026-28405?

1 product: markusproject markus.

Fix CVE-2026-28405 - HIGH markusproject markus

Description

MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: low
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-79 · Cross-site Scripting (XSS)

Metadata

Primary Vendor: MARKUSPROJECT
Published: 3/5/2026
Last Modified: 3/10/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

markusproject : markus

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-28405. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-28405

View on NIST NVD

CVE-2026-28405 vulnerability