CVE-2026-28405 — MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions
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…
Published: 2026-03-05 · CVSS: 8.0 · CVSS 3.1
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: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7