CVE-2026-25057
Undergoing Analysis Undergoing Analysis - In Progress

Path Traversal in MarkUs Assignment Upload Allows Arbitrary File Write

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, 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 Scores

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Meta Information

Published
2026-02-09
Last Modified
2026-02-19
Generated
2026-07-06
AI Q&A
2026-02-09
EPSS Evaluated
2026-07-05
NVD
CVE-2026-25057

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-23 The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

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Detection Guidance

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Executive Summary

This vulnerability exists in the MarkUs web application prior to version 2.9.1. It allows instructors to upload a zip file to create an assignment from an exported configuration. The issue arises because the application uses the zip file entry names to create file paths on disk without validating or checking these paths. This can lead to unsafe file writes.

Impact Analysis

The vulnerability can have severe impacts as indicated by its high CVSS score of 9.1. Because the application does not validate file paths from the uploaded zip, an attacker with instructor privileges could write files to arbitrary locations on the server. This can lead to complete compromise of confidentiality, integrity, and availability of the system.

Compliance Impact

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Mitigation Strategies

The vulnerability is fixed in MarkUs version 2.9.1. The immediate step to mitigate this vulnerability is to upgrade your MarkUs installation to version 2.9.1 or later.

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