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 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...

EUVD-2026-9870

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...

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...

MarkUs 跨站脚本漏洞

MarkUs is an open-source Ruby on Rails and React web application used for submitting and grading student assignments. Versions of MarkUs prior to 2.9.1 had a cross-site scripting vulnerability, which stemmed from failing to properly clean up when reading and rendering the content of student...

CVE-2026-28405: Improper Neutralization of Input During Web Page Generation

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...

PT-2026-23504

Name of the Vulnerable Software and Affected Versions MarkUs versions prior to 2.9.1 Description MarkUs is a web application used for submitting and grading student assignments. Versions prior to 2.9.1 are susceptible to an issue where the application reads and renders the contents of...

CVE-2026-25057

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//assignments/uploadconfigfiles. The uploaded zip file entry names are used to create paths to...

CVE-2026-24900

MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses//assignments//submissions/htmlcontent accepted a selectfileid parameter to serve SubmissionFile objects containing a record of files submitted by students. This parameter was not correct...

CVE-2026-24900

MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses//assignments//submissions/htmlcontent accepted a selectfileid parameter to serve SubmissionFile objects containing a record of files submitted by students. This parameter was not correct...

CVE-2026-25057

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//assignments/uploadconfigfiles. The uploaded zip file entry names are used to create paths to...

CVE-2026-25057

CVE-2026-25057 affects MarkUs prior to version 2.9.1. Instructors can upload a zip file to create an assignment from an exported configuration, and the zip entry names are used to construct paths for writing files to disk without validating those paths. This can allow arbitrary path usage during ...

CVE-2026-25057 Zip Slip in MarkUs config upload allowing RCE

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//assignments/uploadconfigfiles. The uploaded zip file entry names are used to create paths to...

CVE-2026-25057

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//assignments/uploadconfigfiles. The uploaded zip file entry names are used to create paths to...

CVE-2026-25057 Zip Slip in MarkUs config upload allowing RCE

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//assignments/uploadconfigfiles. The uploaded zip file entry names are used to create paths to...

CVE-2026-25057 Zip Slip in MarkUs config upload allowing RCE

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//assignments/uploadconfigfiles. The uploaded zip file entry names are used to create paths to...

CVE-2026-24900 MarkUs has a submission-view IDOR exposes all student submissions

MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses//assignments//submissions/htmlcontent accepted a selectfileid parameter to serve SubmissionFile objects containing a record of files submitted by students. This parameter was not correct...

CVE-2026-24900 MarkUs has a submission-view IDOR exposes all student submissions

MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses//assignments//submissions/htmlcontent accepted a selectfileid parameter to serve SubmissionFile objects containing a record of files submitted by students. This parameter was not correct...