David Liu

3 exploits Active since Feb 2026
CVE-2026-28405 WRITEUP HIGH WRITEUP
markusproject/markus < 2.9.1 - Stored Cross-Site Scripting via HTML Content Rendering
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.
CVSS 8.0
CVE-2026-24900 WRITEUP MEDIUM WRITEUP
Markus < 2.9.1 - Authorization Bypass via Submission File ID Parameter
MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content accepted a select_file_id parameter to serve SubmissionFile objects containing a record of files submitted by students. This parameter was not correctly scoped to the requesting user, allowing users access arbitrary submission file contents by id. This vulnerability is fixed in 2.9.1.
CVSS 6.5
CVE-2026-25057 WRITEUP CRITICAL WRITEUP
Markus < 2.9.1 - Path Traversal via Assignment Configuration Upload
MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, instructors are able to upload a zip file to create an assignment from an exported configuration (courses/<:course_id>/assignments/upload_config_files). The uploaded zip file entry names are used to create paths to write files to disk without checking these paths. This vulnerability is fixed in 2.9.1.
CVSS 9.1