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.
History

Fri, 06 Mar 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 06 Mar 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Markusproject
Markusproject markus
Vendors & Products Markusproject
Markusproject markus

Thu, 05 Mar 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-05T20:06:13.433Z

Updated: 2026-03-06T17:04:05.190Z

Reserved: 2026-02-27T15:33:57.289Z

Link: CVE-2026-28405

cve-icon Vulnrichment

Updated: 2026-03-06T17:04:00.884Z

cve-icon NVD

Status : Received

Published: 2026-03-05T21:16:21.707

Modified: 2026-03-05T21:16:21.707

Link: CVE-2026-28405

cve-icon Redhat

No data.