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    CVE-2026-28405

    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.

    Published:Mar 5, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 5, 2026
    EPSS Score:0.00038
    CVSS Score:8

    Affected Products

    Vendor
    Markusproject
    Product
    Markus

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-25962 (CVSS 6.5) — MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, Mar…
    CVE-2026-27807 (CVSS 4.9) — MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, Mar…
    CVE-2026-25057 (CVSS 9.1) — MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, instructors…
    CVE-2026-24900 (CVSS 6.5) — MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses…
    CVE-2024-51743 (CVSS 7.1) — MarkUs is a web application for the submission and grading of student assignments. In versions prior to 2.4.8,…
    CVE-2024-51499 (CVSS 7.1) — MarkUs is a web application for the submission and grading of student assignments. In versions prior to 2.4.8,…
    CVE-2024-47820 (CVSS 5.7) — MarkUs, a web application for the submission and grading of student assignments, is vulnerable to path travers…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High