CVE-2026-28405

MarkUs (web-based submission and grading system) is affected by CVE-2026-28405 through the submissions/html_content route, where content from a student-submitted file is rendered without sanitization prior to version 2.9.1. The root cause is lack of input sanitization in how submitted files are r...

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//assignments//submissions/htmlcontent route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1...

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//assignments//submissions/htmlcontent route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1...