CVE-2026-28405

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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-05 | Updated 2026-03-06 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...Markus/security/advisories/GHSA-p5pc-pxrj-3893

github.com/...ommit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036

github.com/MarkUsProject/Markus/releases/tag/v2.9.1

cve.org (CVE-2026-28405)

nvd.nist.gov (CVE-2026-28405)

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