CVE-2026-28405
MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions
Summary
MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- web github.com