CVE-2026-24900
Undergoing Analysis Undergoing Analysis - In Progress
Insecure Direct Object Reference in MarkUs Submission Files

Publication date: 2026-02-09

Last updated on: 2026-02-19

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-02-09
Last Modified
2026-02-19
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-24900
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
markusproject markus to 2.9.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
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Executive Summary

This vulnerability exists in the MarkUs web application prior to version 2.9.1. The application accepts a parameter called select_file_id in a specific URL path related to assignment submissions. This parameter is intended to serve files submitted by students. However, it was not properly restricted to the requesting user, which means that users could access submission files belonging to other users by specifying arbitrary file IDs.

Impact Analysis

The vulnerability allows unauthorized users to access the contents of submission files that do not belong to them. This can lead to exposure of sensitive student data or assignment content, potentially compromising privacy and academic integrity.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, upgrade MarkUs to version 2.9.1 or later, where the issue has been fixed.

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